diff --git a/404.html b/404.html
index 33378e9..42d79e0 100644
--- a/404.html
+++ b/404.html
@@ -270,6 +270,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="/git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -503,72 +515,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
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-        Big Data
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-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="/big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="/big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="/big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
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-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
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-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -606,7 +557,68 @@
 
   <li class="md-nav__item">
     <a href="/databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="/big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="/big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="/big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/CONTRIBUTING/index.html b/CONTRIBUTING/index.html
index 087a9ec..696b644 100644
--- a/CONTRIBUTING/index.html
+++ b/CONTRIBUTING/index.html
@@ -270,6 +270,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -503,72 +515,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
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-        Big Data
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-          
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-
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-      Introduction
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-
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-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -606,7 +557,68 @@
 
   <li class="md-nav__item">
     <a href="../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/big_data/evolution/index.html b/big_data/evolution/index.html
index 83c37d4..032c669 100644
--- a/big_data/evolution/index.html
+++ b/big_data/evolution/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -505,18 +517,79 @@
           
           
 
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
+    <label class="md-nav__link" for="nav-4-1">
+      NoSQL Concepts
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-1">
+        <span class="md-nav__icon md-icon"></span>
+        NoSQL Concepts
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../databases_nosql/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../databases_nosql/key_concepts/" class="md-nav__link">
+      Key Concepts
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../databases_nosql/further_reading/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
   
 
 
   <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" checked>
-    <label class="md-nav__link" for="nav-4-1">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" checked>
+    <label class="md-nav__link" for="nav-4-2">
       Big Data
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
+      <label class="md-nav__title" for="nav-4-2">
         <span class="md-nav__icon md-icon"></span>
         Big Data
       </label>
@@ -563,68 +636,7 @@
 
   <li class="md-nav__item">
     <a href="../tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
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-        
-      </ul>
-    </nav>
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-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
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-        NoSQL Concepts
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-          
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-
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-    <a href="../../databases_nosql/intro/" class="md-nav__link">
-      Introduction
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-          
-
-
-  <li class="md-nav__item">
-    <a href="../../databases_nosql/key_concepts/" class="md-nav__link">
-      Key Concepts
-    </a>
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-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
     </a>
   </li>
 
@@ -992,7 +1004,7 @@ What is the output of running the pig queries in the right column against the da
                 <span class="md-footer-nav__direction">
                   Next
                 </span>
-                Tasks and conclusion
+                Conclusion
               </div>
             </div>
             <div class="md-footer-nav__button md-icon">
diff --git a/big_data/intro/index.html b/big_data/intro/index.html
index 0850f8c..09b18dd 100644
--- a/big_data/intro/index.html
+++ b/big_data/intro/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -505,18 +517,79 @@
           
           
 
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
+    <label class="md-nav__link" for="nav-4-1">
+      NoSQL Concepts
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-1">
+        <span class="md-nav__icon md-icon"></span>
+        NoSQL Concepts
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../databases_nosql/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../databases_nosql/key_concepts/" class="md-nav__link">
+      Key Concepts
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../databases_nosql/further_reading/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
   
 
 
   <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" checked>
-    <label class="md-nav__link" for="nav-4-1">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" checked>
+    <label class="md-nav__link" for="nav-4-2">
       Big Data
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
+      <label class="md-nav__title" for="nav-4-2">
         <span class="md-nav__icon md-icon"></span>
         Big Data
       </label>
@@ -581,23 +654,10 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#course-content" class="md-nav__link">
-    Course Content
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
-    <nav class="md-nav" aria-label="Course Content">
-      <ul class="md-nav__list">
-        
-          <li class="md-nav__item">
-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
-  </a>
-  
-</li>
-        
-      </ul>
-    </nav>
-  
 </li>
       
     </ul>
@@ -626,68 +686,7 @@
 
   <li class="md-nav__item">
     <a href="../tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
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-    <label class="md-nav__link" for="nav-4-2">
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-        NoSQL Concepts
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-
-
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-    <a href="../../databases_nosql/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../databases_nosql/key_concepts/" class="md-nav__link">
-      Key Concepts
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
     </a>
   </li>
 
@@ -941,23 +940,10 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#course-content" class="md-nav__link">
-    Course Content
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
-    <nav class="md-nav" aria-label="Course Content">
-      <ul class="md-nav__list">
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-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
-  </a>
-  
-</li>
-        
-      </ul>
-    </nav>
-  
 </li>
       
     </ul>
@@ -983,8 +969,7 @@
 <p>This course covers the basics of Big Data and how it has evolved to become what it is today. We will take a look at a few realistic scenarios where Big Data would be a perfect fit. An interesting assignment on designing a Big Data system is followed by understanding the architecture of Hadoop and the tooling around it. </p>
 <h2 id="what-is-not-covered-under-this-course">What is not covered under this course</h2>
 <p>Writing programs to draw analytics from data.</p>
-<h2 id="course-content">Course Content</h2>
-<h3 id="table-of-contents">Table of Contents</h3>
+<h2 id="course-contents">Course Contents</h2>
 <ol>
 <li><a href="https://linkedin.github.io/school-of-sre/big_data/intro/#overview-of-big-data">Overview of Big Data</a></li>
 <li><a href="https://linkedin.github.io/school-of-sre/big_data/intro/#usage-of-big-data-techniques">Usage of Big Data techniques</a></li>
@@ -1055,7 +1040,7 @@
     <div class="md-footer-nav">
       <nav class="md-footer-nav__inner md-grid" aria-label="Footer">
         
-          <a href="../../python_web/sre-conclusion/" class="md-footer-nav__link md-footer-nav__link--prev" rel="prev">
+          <a href="../../databases_nosql/further_reading/" class="md-footer-nav__link md-footer-nav__link--prev" rel="prev">
             <div class="md-footer-nav__button md-icon">
               <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12z"/></svg>
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diff --git a/big_data/tasks/index.html b/big_data/tasks/index.html
index 1ded611..b43f402 100644
--- a/big_data/tasks/index.html
+++ b/big_data/tasks/index.html
@@ -14,7 +14,7 @@
     
     
       
-        <title>Tasks and conclusion - SchoolOfSRE</title>
+        <title>Conclusion - SchoolOfSRE</title>
       
     
     
@@ -85,7 +85,7 @@
           </span>
           <span class="md-header-nav__topic md-ellipsis">
             
-              Tasks and conclusion
+              Conclusion
             
           </span>
         </div>
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -505,18 +517,79 @@
           
           
 
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
+    <label class="md-nav__link" for="nav-4-1">
+      NoSQL Concepts
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-1">
+        <span class="md-nav__icon md-icon"></span>
+        NoSQL Concepts
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../databases_nosql/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../databases_nosql/key_concepts/" class="md-nav__link">
+      Key Concepts
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../databases_nosql/further_reading/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
   
 
 
   <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" checked>
-    <label class="md-nav__link" for="nav-4-1">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" checked>
+    <label class="md-nav__link" for="nav-4-2">
       Big Data
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
+      <label class="md-nav__title" for="nav-4-2">
         <span class="md-nav__icon md-icon"></span>
         Big Data
       </label>
@@ -562,12 +635,12 @@
     
     
       <label class="md-nav__link md-nav__link--active" for="__toc">
-        Tasks and conclusion
+        Conclusion
         <span class="md-nav__icon md-icon"></span>
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     <a href="./" class="md-nav__link md-nav__link--active">
-      Tasks and conclusion
+      Conclusion
     </a>
     
       
@@ -609,67 +682,6 @@
   </li>
 
         
-          
-          
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-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
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-    </label>
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-      <label class="md-nav__title" for="nav-4-2">
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-        NoSQL Concepts
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../databases_nosql/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../databases_nosql/key_concepts/" class="md-nav__link">
-      Key Concepts
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
       </ul>
     </nav>
   </li>
@@ -971,7 +983,7 @@
           </a>
         
         
-          <a href="../../databases_nosql/intro/" class="md-footer-nav__link md-footer-nav__link--next" rel="next">
+          <a href="../../systems_design/intro/" class="md-footer-nav__link md-footer-nav__link--next" rel="next">
             <div class="md-footer-nav__title">
               <div class="md-ellipsis">
                 <span class="md-footer-nav__direction">
diff --git a/databases_nosql/further_reading/index.html b/databases_nosql/further_reading/index.html
index 3e4a3ea..5dd73cd 100644
--- a/databases_nosql/further_reading/index.html
+++ b/databases_nosql/further_reading/index.html
@@ -14,7 +14,7 @@
     
     
       
-        <title>References - SchoolOfSRE</title>
+        <title>Conclusion - SchoolOfSRE</title>
       
     
     
@@ -85,7 +85,7 @@
           </span>
           <span class="md-header-nav__topic md-ellipsis">
             
-              References
+              Conclusion
             
           </span>
         </div>
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -505,79 +517,18 @@
           
           
 
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
-    <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
   
 
 
   <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" checked>
-    <label class="md-nav__link" for="nav-4-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" checked>
+    <label class="md-nav__link" for="nav-4-1">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -623,7 +574,7 @@
     
     
     <a href="./" class="md-nav__link md-nav__link--active">
-      References
+      Conclusion
     </a>
     
   </li>
@@ -634,6 +585,67 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -863,17 +875,17 @@
                 
                 <h1 id="further-reading">Further reading:</h1>
 <p>NoSQL:</p>
-<p>https://hostingdata.co.uk/nosql-database/</p>
-<p>https://www.mongodb.com/nosql-explained</p>
-<p>https://www.mongodb.com/nosql-explained/nosql-vs-sql</p>
+<p><a href="https://hostingdata.co.uk/nosql-database/">https://hostingdata.co.uk/nosql-database/</a></p>
+<p><a href="https://www.mongodb.com/nosql-explained">https://www.mongodb.com/nosql-explained</a></p>
+<p><a href="https://www.mongodb.com/nosql-explained/nosql-vs-sql">https://www.mongodb.com/nosql-explained/nosql-vs-sql</a></p>
 <p>Cap Theorem</p>
-<p>http://www.julianbrowne.com/article/brewers-cap-theorem</p>
+<p><a href="http://www.julianbrowne.com/article/brewers-cap-theorem">http://www.julianbrowne.com/article/brewers-cap-theorem</a></p>
 <p>Scalability</p>
-<p>http://www.slideshare.net/jboner/scalability-availability-stability-patterns</p>
+<p><a href="http://www.slideshare.net/jboner/scalability-availability-stability-patterns">http://www.slideshare.net/jboner/scalability-availability-stability-patterns</a></p>
 <p>Eventual Consistency</p>
-<p>https://www.allthingsdistributed.com/2008/12/eventually_consistent.html</p>
-<p>https://www.toptal.com/big-data/consistent-hashing</p>
-<p>https://web.stanford.edu/class/cs244/papers/chord_TON_2003.pdf</p>
+<p><a href="https://www.allthingsdistributed.com/2008/12/eventually_consistent.html">https://www.allthingsdistributed.com/2008/12/eventually_consistent.html</a></p>
+<p><a href="https://www.toptal.com/big-data/consistent-hashing">https://www.toptal.com/big-data/consistent-hashing</a></p>
+<p><a href="https://web.stanford.edu/class/cs244/papers/chord_TON_2003.pdf">https://web.stanford.edu/class/cs244/papers/chord_TON_2003.pdf</a></p>
                 
               
               
@@ -907,7 +919,7 @@
           </a>
         
         
-          <a href="../../systems_design/intro/" class="md-footer-nav__link md-footer-nav__link--next" rel="next">
+          <a href="../../big_data/intro/" class="md-footer-nav__link md-footer-nav__link--next" rel="next">
             <div class="md-footer-nav__title">
               <div class="md-ellipsis">
                 <span class="md-footer-nav__direction">
diff --git a/databases_nosql/intro/index.html b/databases_nosql/intro/index.html
index ebbab29..9260a97 100644
--- a/databases_nosql/intro/index.html
+++ b/databases_nosql/intro/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -505,79 +517,18 @@
           
           
 
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
-    <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
   
 
 
   <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" checked>
-    <label class="md-nav__link" for="nav-4-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" checked>
+    <label class="md-nav__link" for="nav-4-1">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -635,8 +586,8 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
 </li>
@@ -708,7 +659,68 @@
 
   <li class="md-nav__item">
     <a href="../further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -955,8 +967,8 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
 </li>
@@ -1020,14 +1032,14 @@
 <p>At the end of training, you will have an understanding of what a NoSQL database is, what kind of advantages or disadvantages it has over traditional RDBMS, learn about different types of NoSQL databases and understand some of the underlying concepts &amp; trade offs w.r.t to NoSQL.</p>
 <h2 id="what-is-not-covered-under-this-course">What is not covered under this course</h2>
 <p>We will not be deep diving into any specific NoSQL Database. </p>
-<h2 id="table-of-contents">Table of Contents</h2>
+<h2 id="course-contents">Course Contents</h2>
 <ul>
-<li>Introduction to NoSQL</li>
-<li>CAP Theorem</li>
-<li>Data versioning</li>
-<li>Partitioning</li>
-<li>Hashing</li>
-<li>Quorum</li>
+<li><a href="https://linkedin.github.io/school-of-sre/databases_nosql/intro/#introduction">Introduction to NoSQL</a></li>
+<li><a href="https://linkedin.github.io/school-of-sre/databases_nosql/key_concepts/#cap-theorem">CAP Theorem</a></li>
+<li><a href="https://linkedin.github.io/school-of-sre/databases_nosql/key_concepts/#versioning-of-data-in-distributed-systems">Data versioning</a></li>
+<li><a href="https://linkedin.github.io/school-of-sre/databases_nosql/key_concepts/#partitioning">Partitioning</a></li>
+<li><a href="https://linkedin.github.io/school-of-sre/databases_nosql/key_concepts/#hashing">Hashing</a></li>
+<li><a href="https://linkedin.github.io/school-of-sre/databases_nosql/key_concepts/#quorum">Quorum</a></li>
 </ul>
 <h2 id="introduction">Introduction</h2>
 <p>When people use the term “NoSQL database”, they typically use it to refer to any non-relational database. Some say the term “NoSQL” stands for “non SQL” while others say it stands for “not only SQL.” Either way, most agree that NoSQL databases are databases that store data in a format other than relational tables.</p>
@@ -1221,7 +1233,7 @@
     <div class="md-footer-nav">
       <nav class="md-footer-nav__inner md-grid" aria-label="Footer">
         
-          <a href="../../big_data/tasks/" class="md-footer-nav__link md-footer-nav__link--prev" rel="prev">
+          <a href="../../python_web/sre-conclusion/" class="md-footer-nav__link md-footer-nav__link--prev" rel="prev">
             <div class="md-footer-nav__button md-icon">
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             </div>
@@ -1230,7 +1242,7 @@
                 <span class="md-footer-nav__direction">
                   Previous
                 </span>
-                Tasks and conclusion
+                Conclusion
               </div>
             </div>
           </a>
diff --git a/databases_nosql/key_concepts/index.html b/databases_nosql/key_concepts/index.html
index b09487e..7cd1819 100644
--- a/databases_nosql/key_concepts/index.html
+++ b/databases_nosql/key_concepts/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -505,16 +517,158 @@
           
           
 
+  
+
+
+  <li class="md-nav__item md-nav__item--active md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" checked>
+    <label class="md-nav__link" for="nav-4-1">
+      NoSQL Concepts
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-1">
+        <span class="md-nav__icon md-icon"></span>
+        NoSQL Concepts
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+  
+
+
+  <li class="md-nav__item md-nav__item--active">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="toc" type="checkbox" id="__toc">
+    
+      
+    
+    
+      <label class="md-nav__link md-nav__link--active" for="__toc">
+        Key Concepts
+        <span class="md-nav__icon md-icon"></span>
+      </label>
+    
+    <a href="./" class="md-nav__link md-nav__link--active">
+      Key Concepts
+    </a>
+    
+      
+<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
+  
+  
+    
+  
+  
+    <label class="md-nav__title" for="__toc">
+      <span class="md-nav__icon md-icon"></span>
+      Table of contents
+    </label>
+    <ul class="md-nav__list" data-md-scrollfix>
+      
+        <li class="md-nav__item">
+  <a href="#cap-theorem" class="md-nav__link">
+    CAP Theorem
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#versioning-of-data-in-distributed-systems" class="md-nav__link">
+    Versioning of Data in distributed systems
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#partitioning" class="md-nav__link">
+    Partitioning
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#hashing" class="md-nav__link">
+    Hashing
+  </a>
+  
+    <nav class="md-nav" aria-label="Hashing">
+      <ul class="md-nav__list">
+        
+          <li class="md-nav__item">
+  <a href="#consistent-hashing" class="md-nav__link">
+    Consistent Hashing
+  </a>
+  
+</li>
+        
+      </ul>
+    </nav>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#quorum" class="md-nav__link">
+    Quorum
+  </a>
+  
+</li>
+      
+    </ul>
+  
+</nav>
+    
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../further_reading/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
-    <label class="md-nav__link" for="nav-4-1">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
       Big Data
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
+      <label class="md-nav__title" for="nav-4-2">
         <span class="md-nav__icon md-icon"></span>
         Big Data
       </label>
@@ -552,158 +706,7 @@
 
   <li class="md-nav__item">
     <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
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-    <label class="md-nav__link" for="nav-4-2">
-      NoSQL Concepts
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-    <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
-        <span class="md-nav__icon md-icon"></span>
-        NoSQL Concepts
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-        Key Concepts
-        <span class="md-nav__icon md-icon"></span>
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-      Key Concepts
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-<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
-  
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-      Table of contents
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-    <ul class="md-nav__list" data-md-scrollfix>
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-    Key Concepts
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-  
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-      <ul class="md-nav__list">
-        
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-  <a href="#cap-theorem" class="md-nav__link">
-    CAP Theorem
-  </a>
-  
-</li>
-        
-          <li class="md-nav__item">
-  <a href="#versioning-of-data-in-distributed-systems" class="md-nav__link">
-    Versioning of Data in distributed systems
-  </a>
-  
-</li>
-        
-          <li class="md-nav__item">
-  <a href="#partitioning" class="md-nav__link">
-    Partitioning
-  </a>
-  
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-    Hashing
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-  <a href="#consistent-hashing" class="md-nav__link">
-    Consistent Hashing
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-  
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-        
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-    Quorum
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-      
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-  
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-
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-          
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-  <li class="md-nav__item">
-    <a href="../further_reading/" class="md-nav__link">
-      References
+      Conclusion
     </a>
   </li>
 
@@ -926,6 +929,8 @@
 <nav class="md-nav md-nav--secondary" aria-label="Table of contents">
   
   
+    
+  
   
     <label class="md-nav__title" for="__toc">
       <span class="md-nav__icon md-icon"></span>
@@ -934,35 +939,27 @@
     <ul class="md-nav__list" data-md-scrollfix>
       
         <li class="md-nav__item">
-  <a href="#key-concepts" class="md-nav__link">
-    Key Concepts
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-  
-    <nav class="md-nav" aria-label="Key Concepts">
-      <ul class="md-nav__list">
-        
-          <li class="md-nav__item">
   <a href="#cap-theorem" class="md-nav__link">
     CAP Theorem
   </a>
   
 </li>
-        
-          <li class="md-nav__item">
+      
+        <li class="md-nav__item">
   <a href="#versioning-of-data-in-distributed-systems" class="md-nav__link">
     Versioning of Data in distributed systems
   </a>
   
 </li>
-        
-          <li class="md-nav__item">
+      
+        <li class="md-nav__item">
   <a href="#partitioning" class="md-nav__link">
     Partitioning
   </a>
   
 </li>
-        
-          <li class="md-nav__item">
+      
+        <li class="md-nav__item">
   <a href="#hashing" class="md-nav__link">
     Hashing
   </a>
@@ -981,17 +978,12 @@
     </nav>
   
 </li>
-        
-          <li class="md-nav__item">
+      
+        <li class="md-nav__item">
   <a href="#quorum" class="md-nav__link">
     Quorum
   </a>
   
-</li>
-        
-      </ul>
-    </nav>
-  
 </li>
       
     </ul>
@@ -1007,9 +999,7 @@
               
                 
                 
-                  <h1>Key Concepts</h1>
-                
-                <h2 id="key-concepts">Key Concepts</h2>
+                <h1 id="key-concepts">Key Concepts</h1>
 <p>Lets looks at some of the key concepts when we talk about NoSQL or distributed systems</p>
 <h3 id="cap-theorem">CAP Theorem</h3>
 <p>In a keynote titled “<a href="https://sites.cs.ucsb.edu/~rich/class/cs293b-cloud/papers/Brewer_podc_keynote_2000.pdf">Towards Robust Distributed Systems</a>” at ACM’s PODC symposium in 2000 Eric Brewer came up with the so-called CAP-theorem which is widely adopted today by large web companies as well as in the NoSQL community. The CAP acronym stands for <strong>C</strong>onsistency, <strong>A</strong>vailability &amp; <strong>P</strong>artition Tolerance.</p>
@@ -1238,7 +1228,7 @@ n -&gt; no of nodes
                 <span class="md-footer-nav__direction">
                   Next
                 </span>
-                References
+                Conclusion
               </div>
             </div>
             <div class="md-footer-nav__button md-icon">
diff --git a/git/branches/index.html b/git/branches/index.html
index 91e34af..6ff92d0 100644
--- a/git/branches/index.html
+++ b/git/branches/index.html
@@ -317,6 +317,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -550,72 +562,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
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-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
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-        Big Data
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-      Introduction
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-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
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     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -653,7 +604,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
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+    </nav>
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+      </label>
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+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
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+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/git/conclusion/index.html b/git/conclusion/index.html
new file mode 100644
index 0000000..25637d6
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+++ b/git/conclusion/index.html
@@ -0,0 +1,1006 @@
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+
+  <li class="md-nav__item">
+    <a href="../../linux_networking/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-3" type="checkbox" id="nav-3" >
+    <label class="md-nav__link" for="nav-3">
+      Python and Web
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Python and Web" data-md-level="1">
+      <label class="md-nav__title" for="nav-3">
+        <span class="md-nav__icon md-icon"></span>
+        Python and Web
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../python_web/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../python_web/python-concepts/" class="md-nav__link">
+      Some Python Concepts
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../python_web/python-web-flask/" class="md-nav__link">
+      Python, Web and Flask
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../python_web/url-shorten-app/" class="md-nav__link">
+      The URL Shortening App
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../python_web/sre-conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4" type="checkbox" id="nav-4" >
+    <label class="md-nav__link" for="nav-4">
+      Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Data" data-md-level="1">
+      <label class="md-nav__title" for="nav-4">
+        <span class="md-nav__icon md-icon"></span>
+        Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
+    <label class="md-nav__link" for="nav-4-1">
+      NoSQL Concepts
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-1">
+        <span class="md-nav__icon md-icon"></span>
+        NoSQL Concepts
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../databases_nosql/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../databases_nosql/key_concepts/" class="md-nav__link">
+      Key Concepts
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../databases_nosql/further_reading/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-5" type="checkbox" id="nav-5" >
+    <label class="md-nav__link" for="nav-5">
+      Systems Design
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Systems Design" data-md-level="1">
+      <label class="md-nav__title" for="nav-5">
+        <span class="md-nav__icon md-icon"></span>
+        Systems Design
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../systems_design/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../systems_design/scalability/" class="md-nav__link">
+      Scalability
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../systems_design/availability/" class="md-nav__link">
+      Availability
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../systems_design/fault-tolerance/" class="md-nav__link">
+      Fault Tolerance
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../systems_design/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-6" type="checkbox" id="nav-6" >
+    <label class="md-nav__link" for="nav-6">
+      Security
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Security" data-md-level="1">
+      <label class="md-nav__title" for="nav-6">
+        <span class="md-nav__icon md-icon"></span>
+        Security
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../security/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../security/fundamentals/" class="md-nav__link">
+      Fundamentals of Security
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../security/network_security/" class="md-nav__link">
+      Network Security
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../security/threats_attacks_defences/" class="md-nav__link">
+      Threat, Attacks & Defences
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../security/writing_secure_code/" class="md-nav__link">
+      Writing Secure code
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../security/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+    
+      
+      
+      
+
+
+  <li class="md-nav__item">
+    <a href="../../CONTRIBUTING/" class="md-nav__link">
+      Contribute
+    </a>
+  </li>
+
+    
+  </ul>
+</nav>
+                  </div>
+                </div>
+              </div>
+            
+            
+              <div class="md-sidebar md-sidebar--secondary" data-md-component="toc">
+                <div class="md-sidebar__scrollwrap">
+                  <div class="md-sidebar__inner">
+                    
+<nav class="md-nav md-nav--secondary" aria-label="Table of contents">
+  
+  
+  
+    <label class="md-nav__title" for="__toc">
+      <span class="md-nav__icon md-icon"></span>
+      Table of contents
+    </label>
+    <ul class="md-nav__list" data-md-scrollfix>
+      
+        <li class="md-nav__item">
+  <a href="#what-next-from-here" class="md-nav__link">
+    What next from here?
+  </a>
+  
+</li>
+      
+    </ul>
+  
+</nav>
+                  </div>
+                </div>
+              </div>
+            
+          
+          <div class="md-content">
+            <article class="md-content__inner md-typeset">
+              
+                
+                
+                  <h1>Conclusion</h1>
+                
+                <h2 id="what-next-from-here">What next from here?</h2>
+<p>There are a lot of git commands and features which we have not explored here. But with the base built-up, be sure to explore concepts like</p>
+<ul>
+<li>Cherrypick</li>
+<li>Squash</li>
+<li>Amend</li>
+<li>Stash</li>
+<li>Reset</li>
+</ul>
+                
+              
+              
+                
+
+
+              
+            </article>
+          </div>
+        </div>
+      </main>
+      
+        
+<footer class="md-footer">
+  
+    <div class="md-footer-nav">
+      <nav class="md-footer-nav__inner md-grid" aria-label="Footer">
+        
+          <a href="../github-hooks/" class="md-footer-nav__link md-footer-nav__link--prev" rel="prev">
+            <div class="md-footer-nav__button md-icon">
+              <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12z"/></svg>
+            </div>
+            <div class="md-footer-nav__title">
+              <div class="md-ellipsis">
+                <span class="md-footer-nav__direction">
+                  Previous
+                </span>
+                Github and Hooks
+              </div>
+            </div>
+          </a>
+        
+        
+          <a href="../../linux_networking/intro/" class="md-footer-nav__link md-footer-nav__link--next" rel="next">
+            <div class="md-footer-nav__title">
+              <div class="md-ellipsis">
+                <span class="md-footer-nav__direction">
+                  Next
+                </span>
+                Introduction
+              </div>
+            </div>
+            <div class="md-footer-nav__button md-icon">
+              <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11H4z"/></svg>
+            </div>
+          </a>
+        
+      </nav>
+    </div>
+  
+  <div class="md-footer-meta md-typeset">
+    <div class="md-footer-meta__inner md-grid">
+      <div class="md-footer-copyright">
+        
+        Made with
+        <a href="https://squidfunk.github.io/mkdocs-material/" target="_blank" rel="noopener">
+          Material for MkDocs
+        </a>
+      </div>
+      
+    </div>
+  </div>
+</footer>
+      
+    </div>
+    
+      <script src="../../assets/javascripts/vendor.7e0ee788.min.js"></script>
+      <script src="../../assets/javascripts/bundle.b3a72adc.min.js"></script><script id="__lang" type="application/json">{"clipboard.copy": "Copy to clipboard", "clipboard.copied": "Copied to clipboard", "search.config.lang": "en", "search.config.pipeline": "trimmer, stopWordFilter", "search.config.separator": "[\\s\\-]+", "search.placeholder": "Search", "search.result.placeholder": "Type to start searching", "search.result.none": "No matching documents", "search.result.one": "1 matching document", "search.result.other": "# matching documents", "search.result.more.one": "1 more on this page", "search.result.more.other": "# more on this page", "search.result.term.missing": "Missing"}</script>
+      
+      <script>
+        app = initialize({
+          base: "../..",
+          features: [],
+          search: Object.assign({
+            worker: "../../assets/javascripts/worker/search.4ac00218.min.js"
+          }, typeof search !== "undefined" && search)
+        })
+      </script>
+      
+    
+  </body>
+</html>
\ No newline at end of file
diff --git a/git/git-basics/index.html b/git/git-basics/index.html
index 4fe9e22..92b3a95 100644
--- a/git/git-basics/index.html
+++ b/git/git-basics/index.html
@@ -301,23 +301,10 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#course-content" class="md-nav__link">
-    Course Content
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
-    <nav class="md-nav" aria-label="Course Content">
-      <ul class="md-nav__list">
-        
-          <li class="md-nav__item">
-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
-  </a>
-  
-</li>
-        
-      </ul>
-    </nav>
-  
 </li>
       
         <li class="md-nav__item">
@@ -427,6 +414,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -660,72 +659,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -763,7 +701,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -1017,23 +1016,10 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#course-content" class="md-nav__link">
-    Course Content
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
-    <nav class="md-nav" aria-label="Course Content">
-      <ul class="md-nav__list">
-        
-          <li class="md-nav__item">
-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
-  </a>
-  
-</li>
-        
-      </ul>
-    </nav>
-  
 </li>
       
         <li class="md-nav__item">
@@ -1140,8 +1126,7 @@
 <p>As an engineer in the field of computer science, having knowledge of version control tools becomes almost a requirement. While there are a lot of version control tools that exist today like SVN, Mercurial, etc, Git perhaps is the most used one and this course we will be working with Git. While this course does not start with Git 101 and expects basic knowledge of git as a prerequisite, it will reintroduce the git concepts known by you with details covering what is happening under the hood as you execute various git commands. So that next time you run a git command, you will be able to press enter more confidently!</p>
 <h2 id="what-is-not-covered-under-this-course">What is not covered under this course</h2>
 <p>Advanced usage and specifics of internal implementation details of Git.</p>
-<h2 id="course-content">Course Content</h2>
-<h3 id="table-of-contents">Table of Contents</h3>
+<h2 id="course-contents">Course Contents</h2>
 <ol>
 <li><a href="https://linkedin.github.io/school-of-sre/git/git-basics/#git-basics">Git Basics</a></li>
 <li><a href="https://linkedin.github.io/school-of-sre/git/branches/">Working with Branches</a></li>
diff --git a/git/github-hooks/index.html b/git/github-hooks/index.html
index 5fd4481..874e597 100644
--- a/git/github-hooks/index.html
+++ b/git/github-hooks/index.html
@@ -308,13 +308,6 @@
     Hooks
   </a>
   
-</li>
-      
-        <li class="md-nav__item">
-  <a href="#what-next-from-here" class="md-nav__link">
-    What next from here?
-  </a>
-  
 </li>
       
     </ul>
@@ -324,6 +317,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -557,72 +562,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -660,7 +604,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -897,13 +902,6 @@
     Hooks
   </a>
   
-</li>
-      
-        <li class="md-nav__item">
-  <a href="#what-next-from-here" class="md-nav__link">
-    What next from here?
-  </a>
-  
 </li>
       
     </ul>
@@ -950,15 +948,6 @@ this is from pre commit hook     # &lt;===== THE MESSAGE FROM HOOK EXECUTION
 1 file changed, 1 insertion(+)
 create mode 100644 sample.txt
 </code></pre>
-<h2 id="what-next-from-here">What next from here?</h2>
-<p>There are a lot of git commands and features which we have not explored here. But with the base built-up, be sure to explore concepts like</p>
-<ul>
-<li>Cherrypick</li>
-<li>Squash</li>
-<li>Amend</li>
-<li>Stash</li>
-<li>Reset</li>
-</ul>
                 
               
               
@@ -992,13 +981,13 @@ create mode 100644 sample.txt
           </a>
         
         
-          <a href="../../linux_networking/intro/" class="md-footer-nav__link md-footer-nav__link--next" rel="next">
+          <a href="../conclusion/" class="md-footer-nav__link md-footer-nav__link--next" rel="next">
             <div class="md-footer-nav__title">
               <div class="md-ellipsis">
                 <span class="md-footer-nav__direction">
                   Next
                 </span>
-                Introduction
+                Conclusion
               </div>
             </div>
             <div class="md-footer-nav__button md-icon">
diff --git a/index.html b/index.html
index 8c393fe..2dbbf5f 100644
--- a/index.html
+++ b/index.html
@@ -284,6 +284,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -517,72 +529,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -620,7 +571,68 @@
 
   <li class="md-nav__item">
     <a href="databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -873,7 +885,7 @@
 <li><a href="https://linkedin.github.io/school-of-sre/python_web/intro/">Python and Web</a></li>
 <li>Data<ul>
 <li>Relational databases (MySQL)</li>
-<li>NoSQL concepts </li>
+<li><a href="https://linkedin.github.io/school-of-sre/databases_nosql/intro/">NoSQL concepts</a> </li>
 <li><a href="https://linkedin.github.io/school-of-sre/big_data/intro/">Big Data</a></li>
 </ul>
 </li>
diff --git a/linux_basics/command_line_basics/index.html b/linux_basics/command_line_basics/index.html
index e0b0937..f6dc576 100644
--- a/linux_basics/command_line_basics/index.html
+++ b/linux_basics/command_line_basics/index.html
@@ -488,6 +488,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -721,72 +733,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -824,7 +775,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/linux_basics/conclusion/index.html b/linux_basics/conclusion/index.html
index 373f1de..d4a0d59 100644
--- a/linux_basics/conclusion/index.html
+++ b/linux_basics/conclusion/index.html
@@ -324,6 +324,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -557,72 +569,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -660,7 +611,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/linux_basics/intro/index.html b/linux_basics/intro/index.html
index 4c34051..a94017e 100644
--- a/linux_basics/intro/index.html
+++ b/linux_basics/intro/index.html
@@ -228,8 +228,8 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#course-content" class="md-nav__link">
-    Course Content
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
 </li>
@@ -380,6 +380,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -613,72 +625,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -716,7 +667,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -970,8 +982,8 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#course-content" class="md-nav__link">
-    Course Content
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
 </li>
@@ -1052,7 +1064,7 @@ managing file permissions, monitoring system performance, log files etc.</p>
 <h2 id="what-is-not-covered-under-this-course">What is not covered under this course</h2>
 <p>We are not covering advanced linux commands and bash scripting in this
 course. We will also not be covering linux internals. </p>
-<h2 id="course-content">Course Content</h2>
+<h2 id="course-contents">Course Contents</h2>
 <p>The following topics has been covered in this course:</p>
 <ul>
 <li><a href="https://linkedin.github.io/school-of-sre/linux_basics/intro/">Introduction to Linux</a><ul>
diff --git a/linux_basics/linux_server_administration/index.html b/linux_basics/linux_server_administration/index.html
index 248209a..0f2893d 100644
--- a/linux_basics/linux_server_administration/index.html
+++ b/linux_basics/linux_server_administration/index.html
@@ -596,6 +596,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -829,72 +841,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -932,7 +883,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/linux_networking/conclusion/index.html b/linux_networking/conclusion/index.html
index 6dc27ea..81c97e6 100644
--- a/linux_networking/conclusion/index.html
+++ b/linux_networking/conclusion/index.html
@@ -277,6 +277,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -521,72 +533,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -624,7 +575,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/linux_networking/dns/index.html b/linux_networking/dns/index.html
index ca191fb..0f72375 100644
--- a/linux_networking/dns/index.html
+++ b/linux_networking/dns/index.html
@@ -277,6 +277,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -550,72 +562,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -653,7 +604,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/linux_networking/http/index.html b/linux_networking/http/index.html
index 8254882..97daf58 100644
--- a/linux_networking/http/index.html
+++ b/linux_networking/http/index.html
@@ -277,6 +277,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -521,72 +533,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -624,7 +575,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/linux_networking/intro/index.html b/linux_networking/intro/index.html
index f734f38..507ac93 100644
--- a/linux_networking/intro/index.html
+++ b/linux_networking/intro/index.html
@@ -277,6 +277,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -362,28 +374,15 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#course-content" class="md-nav__link">
-    Course Content
-  </a>
-  
-    <nav class="md-nav" aria-label="Course Content">
-      <ul class="md-nav__list">
-        
-          <li class="md-nav__item">
   <a href="#birds-eye-view-of-the-course" class="md-nav__link">
     Birds eye view of the course
   </a>
   
-</li>
-        
-      </ul>
-    </nav>
-  
 </li>
       
         <li class="md-nav__item">
-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
 </li>
@@ -591,72 +590,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -694,7 +632,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -948,28 +947,15 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#course-content" class="md-nav__link">
-    Course Content
-  </a>
-  
-    <nav class="md-nav" aria-label="Course Content">
-      <ul class="md-nav__list">
-        
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   <a href="#birds-eye-view-of-the-course" class="md-nav__link">
     Birds eye view of the course
   </a>
   
-</li>
-        
-      </ul>
-    </nav>
-  
 </li>
       
         <li class="md-nav__item">
-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
 </li>
@@ -994,10 +980,9 @@
 <p>Throughout the course, we cover how an SRE can optimize the system to improve their web stack performance and troubleshoot if there is an issue in any of the layers of the networking stack. This course tries to dig through each layer of traditional TCP/IP stack and expects an SRE to have a picture beyond the bird’s eye view of the functioning of the Internet.</p>
 <h2 id="what-is-not-covered-under-this-course">What is not covered under this course</h2>
 <p>This course spends time on the fundamentals. We are not covering concepts like HTTP/2.0, QUIC, TCP congestion control protocols, Anycast, BGP, CDN, Tunnels and Multicast. We expect that this course will provide the relevant basics to understand such concepts</p>
-<h2 id="course-content">Course Content</h2>
-<h3 id="birds-eye-view-of-the-course">Birds eye view of the course</h3>
+<h2 id="birds-eye-view-of-the-course">Birds eye view of the course</h2>
 <p>The course covers the question “What happens when you open linkedin.com in your browser?” The course follows the flow of TCP/IP stack.More specifically, the course covers topics of Application layer protocols DNS and HTTP, transport layer protocols UDP and TCP, networking layer protocol IP and Data Link Layer protocol </p>
-<h2 id="table-of-contents">Table of Contents</h2>
+<h2 id="course-contents">Course Contents</h2>
 <ol>
 <li><a href="https://linkedin.github.io/school-of-sre/linux_networking/dns/">DNS</a></li>
 <li><a href="https://linkedin.github.io/school-of-sre/linux_networking/udp/">UDP</a></li>
@@ -1023,7 +1008,7 @@
     <div class="md-footer-nav">
       <nav class="md-footer-nav__inner md-grid" aria-label="Footer">
         
-          <a href="../../git/github-hooks/" class="md-footer-nav__link md-footer-nav__link--prev" rel="prev">
+          <a href="../../git/conclusion/" class="md-footer-nav__link md-footer-nav__link--prev" rel="prev">
             <div class="md-footer-nav__button md-icon">
               <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12z"/></svg>
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@@ -1032,7 +1017,7 @@
                 <span class="md-footer-nav__direction">
                   Previous
                 </span>
-                Github and Hooks
+                Conclusion
               </div>
             </div>
           </a>
diff --git a/linux_networking/ipr/index.html b/linux_networking/ipr/index.html
index 8523f0e..6112cbd 100644
--- a/linux_networking/ipr/index.html
+++ b/linux_networking/ipr/index.html
@@ -277,6 +277,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -550,72 +562,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
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-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
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-        Big Data
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-      <ul class="md-nav__list" data-md-scrollfix>
-        
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-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
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-    
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-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -653,7 +604,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/linux_networking/tcp/index.html b/linux_networking/tcp/index.html
index 1e00bbb..e147d6e 100644
--- a/linux_networking/tcp/index.html
+++ b/linux_networking/tcp/index.html
@@ -277,6 +277,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -550,72 +562,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
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-      Big Data
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-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
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-        Big Data
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-        
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-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
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-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
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-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -653,7 +604,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/linux_networking/udp/index.html b/linux_networking/udp/index.html
index aaac2b5..ab1e8da 100644
--- a/linux_networking/udp/index.html
+++ b/linux_networking/udp/index.html
@@ -277,6 +277,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -550,72 +562,11 @@
     
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-
-
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-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
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-          
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-
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       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -653,7 +604,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/python_web/intro/index.html b/python_web/intro/index.html
index a4e8d52..f72d7a1 100644
--- a/python_web/intro/index.html
+++ b/python_web/intro/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -474,30 +486,17 @@
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-        
-          <li class="md-nav__item">
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     Lab Environment Setup
   </a>
   
 </li>
-        
-          <li class="md-nav__item">
-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
+      
+        <li class="md-nav__item">
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
-</li>
-        
-      </ul>
-    </nav>
-  
 </li>
       
         <li class="md-nav__item">
@@ -616,72 +615,11 @@
     
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-        Big Data
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-          
-
-
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-    <a href="../../big_data/intro/" class="md-nav__link">
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-
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-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
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-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
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-      </ul>
-    </nav>
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-          
-          
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-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -719,7 +657,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -973,30 +972,17 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#course-content" class="md-nav__link">
-    Course Content
-  </a>
-  
-    <nav class="md-nav" aria-label="Course Content">
-      <ul class="md-nav__list">
-        
-          <li class="md-nav__item">
   <a href="#lab-environment-setup" class="md-nav__link">
     Lab Environment Setup
   </a>
   
 </li>
-        
-          <li class="md-nav__item">
-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
+      
+        <li class="md-nav__item">
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
-</li>
-        
-      </ul>
-    </nav>
-  
 </li>
       
         <li class="md-nav__item">
@@ -1051,10 +1037,9 @@
 <p>And to introduce SRE flavour to the course, we will design, develop and deploy (in theory) a URL shortening application. We will emphasize parts of the whole process that are more important as an SRE of the said app/service.</p>
 <h2 id="what-is-not-covered-under-this-course">What is not covered under this course</h2>
 <p>Extensive knowledge of python internals and advanced python.</p>
-<h2 id="course-content">Course Content</h2>
-<h3 id="lab-environment-setup">Lab Environment Setup</h3>
+<h2 id="lab-environment-setup">Lab Environment Setup</h2>
 <p>Have latest version of python installed</p>
-<h3 id="table-of-contents">Table of Contents</h3>
+<h2 id="course-contents">Course Contents</h2>
 <ol>
 <li><a href="https://linkedin.github.io/school-of-sre/python_web/intro/#the-python-language">The Python Language</a><ol>
 <li>Some Python Concepts</li>
diff --git a/python_web/python-concepts/index.html b/python_web/python-concepts/index.html
index 5ade1d6..37cf29f 100644
--- a/python_web/python-concepts/index.html
+++ b/python_web/python-concepts/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
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@@ -582,72 +594,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
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-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -685,7 +636,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/python_web/python-web-flask/index.html b/python_web/python-web-flask/index.html
index 450c423..37a43fe 100644
--- a/python_web/python-web-flask/index.html
+++ b/python_web/python-web-flask/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -555,72 +567,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
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-        Big Data
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-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
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-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
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-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
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-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -658,7 +609,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/python_web/sre-conclusion/index.html b/python_web/sre-conclusion/index.html
index 2ea3e4d..19462e7 100644
--- a/python_web/sre-conclusion/index.html
+++ b/python_web/sre-conclusion/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -515,8 +527,8 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#sre-use-cases" class="md-nav__link">
-    SRE Use-cases
+  <a href="#applications-in-sre-role" class="md-nav__link">
+    Applications in SRE role
   </a>
   
 </li>
@@ -576,72 +588,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
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-      <ul class="md-nav__list" data-md-scrollfix>
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-        
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-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
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-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
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-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -679,7 +630,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -926,8 +938,8 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#sre-use-cases" class="md-nav__link">
-    SRE Use-cases
+  <a href="#applications-in-sre-role" class="md-nav__link">
+    Applications in SRE role
   </a>
   
 </li>
@@ -976,7 +988,7 @@
 <li>We also want to keep an eye on the database so depending on the database solution chosen. Query times, volumes, disk usage etc.</li>
 <li>Finally, there also needs to be some external monitoring which runs periodic tests from devices outside of your data centers. This emulates customers and ensures that from customer point of view, the system is working as expected.</li>
 </ol>
-<h2 id="sre-use-cases">SRE Use-cases</h2>
+<h2 id="applications-in-sre-role">Applications in SRE role</h2>
 <p>In the world of SRE, python is a widely used language. For small scripts and tooling developed for various purposes. Since tooling developed by SRE works with critical pieces of infrastructure and has great power (to bring things down), it is important to know what you are doing while using a programming language and its features. Also it is equally important to know the language and its characteristics while debugging the issues. As an SRE having a deeper understanding of python language, it has helped me a lot to debug very sneaky bugs and be generally more aware and informed while making certain design decisions.</p>
 <p>While developing tools may or may not be part of SRE job, supporting tools or services is more likely to be a daily duty. Building an application or tool is just a small part of productionization. While there is certainly that goes in the design of the application itself to make it more robust, as an SRE you are responsible for its reliability and stability once it is deployed and running. And to ensure that, you’d need to understand the application first and then come up with a strategy to monitor it properly and be prepared for various failure scenarios.</p>
 <h2 id="optional-exercises">Optional Exercises</h2>
@@ -1022,7 +1034,7 @@
           </a>
         
         
-          <a href="../../big_data/intro/" class="md-footer-nav__link md-footer-nav__link--next" rel="next">
+          <a href="../../databases_nosql/intro/" class="md-footer-nav__link md-footer-nav__link--next" rel="next">
             <div class="md-footer-nav__title">
               <div class="md-ellipsis">
                 <span class="md-footer-nav__direction">
diff --git a/python_web/url-shorten-app/index.html b/python_web/url-shorten-app/index.html
index fb3199a..b978ee4 100644
--- a/python_web/url-shorten-app/index.html
+++ b/python_web/url-shorten-app/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -589,72 +601,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
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-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
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-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -692,7 +643,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/security/conclusion/index.html b/security/conclusion/index.html
index b703057..b787963 100644
--- a/security/conclusion/index.html
+++ b/security/conclusion/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -508,72 +520,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -611,7 +562,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -834,6 +846,13 @@
     Other Resources
   </a>
   
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#post-training-asks-further-reading" class="md-nav__link">
+    Post Training asks/ Further Reading
+  </a>
+  
 </li>
       
     </ul>
@@ -888,6 +907,13 @@
     Other Resources
   </a>
   
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#post-training-asks-further-reading" class="md-nav__link">
+    Post Training asks/ Further Reading
+  </a>
+  
 </li>
       
     </ul>
@@ -916,6 +942,15 @@
 <li>Real World Cryptography <a href="https://www.manning.com/books/real-world-cryptography">https://www.manning.com/books/real-world-cryptography</a>- This early-access book teaches you applied cryptographic techniques to understand and apply security at every level of your systems and applications.</li>
 <li>AWS Security <a href="https://www.manning.com/books/aws-security?utm_source=github&amp;utm_medium=organic&amp;utm_campaign=book_shields_aws_1_31_20">https://www.manning.com/books/aws-security?utm_source=github&amp;utm_medium=organic&amp;utm_campaign=book_shields_aws_1_31_20</a>- This early-access book covers commong AWS security issues and best practices for access policies, data protection, auditing, continuous monitoring, and incident response.</li>
 </ul>
+<h2 id="post-training-asks-further-reading">Post Training asks/ Further Reading</h2>
+<ul>
+<li>CTF Events like : <a href="https://github.com/apsdehal/awesome-ctf">https://github.com/apsdehal/awesome-ctf</a></li>
+<li>Penetration Testing : <a href="https://github.com/enaqx/awesome-pentest">https://github.com/enaqx/awesome-pentest</a></li>
+<li>Threat Intelligence  : <a href="https://github.com/hslatman/awesome-threat-intelligence">https://github.com/hslatman/awesome-threat-intelligence</a></li>
+<li>Threat Detection &amp; Hunting : <a href="https://github.com/0x4D31/awesome-threat-detection">https://github.com/0x4D31/awesome-threat-detection</a></li>
+<li>Web Security: <a href="https://github.com/qazbnm456/awesome-web-security">https://github.com/qazbnm456/awesome-web-security</a></li>
+<li>Building Secure and Reliable Systems : <a href="https://landing.google.com/sre/resources/foundationsandprinciples/srs-book/">https://landing.google.com/sre/resources/foundationsandprinciples/srs-book/</a></li>
+</ul>
                 
               
               
diff --git a/security/fundamentals/index.html b/security/fundamentals/index.html
index 5280ec1..c661cd1 100644
--- a/security/fundamentals/index.html
+++ b/security/fundamentals/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -508,72 +520,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -611,7 +562,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/security/intro/index.html b/security/intro/index.html
index 8d764bc..e54b0fb 100644
--- a/security/intro/index.html
+++ b/security/intro/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -508,72 +520,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -611,7 +562,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -791,28 +803,8 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#course-content" class="md-nav__link">
-    Course Content
-  </a>
-  
-    <nav class="md-nav" aria-label="Course Content">
-      <ul class="md-nav__list">
-        
-          <li class="md-nav__item">
-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
-  </a>
-  
-</li>
-        
-      </ul>
-    </nav>
-  
-</li>
-      
-        <li class="md-nav__item">
-  <a href="#post-training-asks-further-reading" class="md-nav__link">
-    Post Training asks/ Further Reading
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
 </li>
@@ -946,28 +938,8 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#course-content" class="md-nav__link">
-    Course Content
-  </a>
-  
-    <nav class="md-nav" aria-label="Course Content">
-      <ul class="md-nav__list">
-        
-          <li class="md-nav__item">
-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
-  </a>
-  
-</li>
-        
-      </ul>
-    </nav>
-  
-</li>
-      
-        <li class="md-nav__item">
-  <a href="#post-training-asks-further-reading" class="md-nav__link">
-    Post Training asks/ Further Reading
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
 </li>
@@ -989,18 +961,17 @@
 <h2 id="prerequisites">Prerequisites</h2>
 <ol>
 <li>
-<p>Basics of Linux fundamentals &amp; command line usage</p>
+<p><a href="https://linkedin.github.io/school-of-sre/linux_basics/intro/">Linux Basics</a></p>
 </li>
 <li>
-<p>Networking Module</p>
+<p><a href="https://linkedin.github.io/school-of-sre/linux_networking/intro/">Linux Networking</a></p>
 </li>
 </ol>
 <h2 id="what-to-expect-from-this-course">What to expect from this course</h2>
 <p>The course covers fundamentals of information security along with touching on subjects of system security, network &amp; web security. The aim of this course is to get familiar with the basics of information security in day to day operations &amp; then as an SRE develop the mindset of ensuring that security takes a  front-seat while developing solutions. The course also serves as an introduction to common risks and best practices along with practical ways to find out vulnerable systems and loopholes which might become compromised if not secured.</p>
 <h2 id="what-is-not-covered-under-this-course">What is not covered under this course</h2>
 <p>The courseware is not an ethical hacking workshop or a very deep dive into the fundamentals of the problems. The course does not deal with hacking or breaking into systems but rather an approach on how to ensure you don’t get into those situations and also to make you aware of different ways a system can be compromised.</p>
-<h2 id="course-content">Course Content</h2>
-<h3 id="table-of-contents">Table of Contents</h3>
+<h2 id="course-contents">Course Contents</h2>
 <ol>
 <li><a href="https://linkedin.github.io/school-of-sre/security/fundamentals/">Fundamentals</a></li>
 <li><a href="https://linkedin.github.io/school-of-sre/security/network_security/">Network Security</a></li>
@@ -1008,15 +979,6 @@
 <li><a href="https://linkedin.github.io/school-of-sre/security/writing_secure_code/">Writing Secure Code &amp; More</a></li>
 <li><a href="https://linkedin.github.io/school-of-sre/security/conclusion/">Conclusion</a></li>
 </ol>
-<h2 id="post-training-asks-further-reading">Post Training asks/ Further Reading</h2>
-<ul>
-<li>CTF Events like : <a href="https://github.com/apsdehal/awesome-ctf">https://github.com/apsdehal/awesome-ctf</a></li>
-<li>Penetration Testing : <a href="https://github.com/enaqx/awesome-pentest">https://github.com/enaqx/awesome-pentest</a></li>
-<li>Threat Intelligence  : <a href="https://github.com/hslatman/awesome-threat-intelligence">https://github.com/hslatman/awesome-threat-intelligence</a></li>
-<li>Threat Detection &amp; Hunting : <a href="https://github.com/0x4D31/awesome-threat-detection">https://github.com/0x4D31/awesome-threat-detection</a></li>
-<li>Web Security: <a href="https://github.com/qazbnm456/awesome-web-security">https://github.com/qazbnm456/awesome-web-security</a></li>
-<li>Building Secure and Reliable Systems : <a href="https://landing.google.com/sre/resources/foundationsandprinciples/srs-book/">https://landing.google.com/sre/resources/foundationsandprinciples/srs-book/</a></li>
-</ul>
                 
               
               
diff --git a/security/network_security/index.html b/security/network_security/index.html
index 4fa95a1..c036e58 100644
--- a/security/network_security/index.html
+++ b/security/network_security/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -508,72 +520,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -611,7 +562,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/security/threats_attacks_defences/index.html b/security/threats_attacks_defences/index.html
index 67e24ac..8016303 100644
--- a/security/threats_attacks_defences/index.html
+++ b/security/threats_attacks_defences/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -508,72 +520,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -611,7 +562,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/security/writing_secure_code/index.html b/security/writing_secure_code/index.html
index 59bf3d7..b810037 100644
--- a/security/writing_secure_code/index.html
+++ b/security/writing_secure_code/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
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@@ -508,72 +520,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
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-
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-          
-
-
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-    <a href="../../big_data/tasks/" class="md-nav__link">
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-          
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@@ -611,7 +562,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/sitemap.xml b/sitemap.xml
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+++ b/sitemap.xml
@@ -151,5 +151,9 @@
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      <changefreq>daily</changefreq>
+    </url><url>
+     <loc>None</loc>
+     <lastmod>2020-11-23</lastmod>
+     <changefreq>daily</changefreq>
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 </urlset>
\ No newline at end of file
diff --git a/sitemap.xml.gz b/sitemap.xml.gz
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index 8261780..5d55f50 100644
--- a/systems_design/availability/index.html
+++ b/systems_design/availability/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
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@@ -508,72 +520,11 @@
     
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-
-
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-      Evolution and Architecure of Hadoop
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-      Tasks and conclusion
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-        
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-          
-
-
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     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
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+      <label class="md-nav__title" for="nav-4-1">
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@@ -611,7 +562,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -790,8 +802,8 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#sre-use-cases" class="md-nav__link">
-    SRE Use cases
+  <a href="#applications-in-sre-role" class="md-nav__link">
+    Applications in SRE role
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 </li>
@@ -1046,8 +1058,8 @@
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         <li class="md-nav__item">
-  <a href="#sre-use-cases" class="md-nav__link">
-    SRE Use cases
+  <a href="#applications-in-sre-role" class="md-nav__link">
+    Applications in SRE role
   </a>
   
 </li>
@@ -1171,7 +1183,7 @@
 <p><strong>HOW TO USE:</strong> Identify how available a system is during the crossover and ensure it is within acceptable limits. </p>
 <p><strong>WHY:</strong> Maximize availability and ensure data handling semantics are preserved.  </p>
 <p><strong>KEY TAKEAWAYS:</strong> Strive for active/active rather than active/passive solutions, they have a lesser risk of cross over being unreliable. Use LB and right load balancing methods to ensure reliable failover. Model and build your data systems to ensure data is correctly handled when crossover happens. Generally DB systems follow active/passive semantics for writes. Masters accept writes and when master goes down, follower is promoted to master(active from being passive) to accept writes. We have to be careful here that the cutover never introduces more than one masters. This problem is called a split brain.</p>
-<h2 id="sre-use-cases">SRE Use cases</h2>
+<h2 id="applications-in-sre-role">Applications in SRE role</h2>
 <ol>
 <li>SRE works on deciding an acceptable SLA and make sure system is available to achieve the SLA</li>
 <li>SRE is involved in architecture design right from building the data center to make sure site is not affected by network switch, hardware, power or software failures</li>
diff --git a/systems_design/conclusion/index.html b/systems_design/conclusion/index.html
index 60185cd..75b501c 100644
--- a/systems_design/conclusion/index.html
+++ b/systems_design/conclusion/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -508,72 +520,11 @@
     
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-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
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-          
-
-
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-      Tasks and conclusion
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@@ -611,7 +562,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
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+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
diff --git a/systems_design/fault-tolerance/index.html b/systems_design/fault-tolerance/index.html
index 59f2073..283d498 100644
--- a/systems_design/fault-tolerance/index.html
+++ b/systems_design/fault-tolerance/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -508,72 +520,11 @@
     
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-        Big Data
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-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
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-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
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-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
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-
-        
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-          
-          
-
-
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       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -611,7 +562,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -775,8 +787,8 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#sre-use-cases" class="md-nav__link">
-    SRE Use cases:
+  <a href="#applications-in-sre-role" class="md-nav__link">
+    Applications in SRE role
   </a>
   
 </li>
@@ -992,8 +1004,8 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#sre-use-cases" class="md-nav__link">
-    SRE Use cases:
+  <a href="#applications-in-sre-role" class="md-nav__link">
+    Applications in SRE role
   </a>
   
 </li>
@@ -1051,7 +1063,7 @@ We can have two architectures
 <ul>
 <li>https://learning.oreilly.com/library/view/the-art-of/9780134031408/ch21.html#ch21</li>
 </ul>
-<h3 id="sre-use-cases">SRE Use cases:</h3>
+<h3 id="applications-in-sre-role">Applications in SRE role</h3>
 <ol>
 <li>Work with the DC tech or cloud team to distribute infrastructure such that its immune to switch or power failures by creating fault zones within a Data Center
 https://docs.microsoft.com/en-us/azure/virtual-machines/manage-availability#use-availability-zones-to-protect-from-datacenter-level-failures</li>
diff --git a/systems_design/intro/index.html b/systems_design/intro/index.html
index 14cbd66..4dd90c5 100644
--- a/systems_design/intro/index.html
+++ b/systems_design/intro/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -508,72 +520,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
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-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -611,7 +562,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -706,23 +718,10 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#course-content" class="md-nav__link">
-    Course Content
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
-    <nav class="md-nav" aria-label="Course Content">
-      <ul class="md-nav__list">
-        
-          <li class="md-nav__item">
-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
-  </a>
-  
-</li>
-        
-      </ul>
-    </nav>
-  
 </li>
       
         <li class="md-nav__item">
@@ -953,23 +952,10 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#course-content" class="md-nav__link">
-    Course Content
+  <a href="#course-contents" class="md-nav__link">
+    Course Contents
   </a>
   
-    <nav class="md-nav" aria-label="Course Content">
-      <ul class="md-nav__list">
-        
-          <li class="md-nav__item">
-  <a href="#table-of-contents" class="md-nav__link">
-    Table of Contents
-  </a>
-  
-</li>
-        
-      </ul>
-    </nav>
-  
 </li>
       
         <li class="md-nav__item">
@@ -1001,17 +987,19 @@
                 
                 <h1 id="systems-design">Systems Design</h1>
 <h2 id="prerequisites">Prerequisites</h2>
-<p>Fundamentals of common software system components:
-- Operating Systems
-- Networking
-- Databases RDBMS/NoSQL</p>
+<p>Fundamentals of common software system components:</p>
+<ul>
+<li><a href="https://linkedin.github.io/school-of-sre/linux_basics/intro/">Linux Basics</a></li>
+<li><a href="https://linkedin.github.io/school-of-sre/linux_networking/intro/">Linux Networking</a></li>
+<li>Databases RDBMS</li>
+<li><a href="https://linkedin.github.io/school-of-sre/databases_nosql/intro/">NoSQL Concepts</a></li>
+</ul>
 <h2 id="what-to-expect-from-this-course">What to expect from this course</h2>
 <p>Thinking about and designing for scalability, availability, and reliability of large scale software systems.</p>
 <h2 id="what-is-not-covered-under-this-course">What is not covered under this course</h2>
 <p>Individual software components’ scalability and reliability concerns like e.g. Databases, while the same scalability principles and thinking can be applied, these individual components have their own specific nuances when scaling them and thinking about their reliability.</p>
 <p>More light will be shed on concepts rather than on setting up and configuring components like Loadbalancers to achieve scalability, availability and reliability of systems</p>
-<h2 id="course-content">Course Content</h2>
-<h3 id="table-of-contents">Table of Contents</h3>
+<h2 id="course-contents">Course Contents</h2>
 <ul>
 <li><a href="https://linkedin.github.io/school-of-sre/systems_design/intro/#backstory">Introduction</a></li>
 <li><a href="https://linkedin.github.io/school-of-sre/systems_design/scalability/">Scalability</a></li>
@@ -1046,7 +1034,7 @@ Jim Waldo, Sun Microsystems, On System Design</em></p>
     <div class="md-footer-nav">
       <nav class="md-footer-nav__inner md-grid" aria-label="Footer">
         
-          <a href="../../databases_nosql/further_reading/" class="md-footer-nav__link md-footer-nav__link--prev" rel="prev">
+          <a href="../../big_data/tasks/" class="md-footer-nav__link md-footer-nav__link--prev" rel="prev">
             <div class="md-footer-nav__button md-icon">
               <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11h12z"/></svg>
             </div>
@@ -1055,7 +1043,7 @@ Jim Waldo, Sun Microsystems, On System Design</em></p>
                 <span class="md-footer-nav__direction">
                   Previous
                 </span>
-                References
+                Conclusion
               </div>
             </div>
           </a>
diff --git a/systems_design/scalability/index.html b/systems_design/scalability/index.html
index e273078..881d541 100644
--- a/systems_design/scalability/index.html
+++ b/systems_design/scalability/index.html
@@ -275,6 +275,18 @@
   </li>
 
         
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../git/conclusion/" class="md-nav__link">
+      Conclusion
+    </a>
+  </li>
+
+        
       </ul>
     </nav>
   </li>
@@ -508,72 +520,11 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-1" type="checkbox" id="nav-4-1" >
     <label class="md-nav__link" for="nav-4-1">
-      Big Data
-      <span class="md-nav__icon md-icon"></span>
-    </label>
-    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-1">
-        <span class="md-nav__icon md-icon"></span>
-        Big Data
-      </label>
-      <ul class="md-nav__list" data-md-scrollfix>
-        
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/intro/" class="md-nav__link">
-      Introduction
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/evolution/" class="md-nav__link">
-      Evolution and Architecure of Hadoop
-    </a>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item">
-    <a href="../../big_data/tasks/" class="md-nav__link">
-      Tasks and conclusion
-    </a>
-  </li>
-
-        
-      </ul>
-    </nav>
-  </li>
-
-        
-          
-          
-          
-
-
-  <li class="md-nav__item md-nav__item--nested">
-    
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
-    <label class="md-nav__link" for="nav-4-2">
       NoSQL Concepts
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="NoSQL Concepts" data-md-level="2">
-      <label class="md-nav__title" for="nav-4-2">
+      <label class="md-nav__title" for="nav-4-1">
         <span class="md-nav__icon md-icon"></span>
         NoSQL Concepts
       </label>
@@ -611,7 +562,68 @@
 
   <li class="md-nav__item">
     <a href="../../databases_nosql/further_reading/" class="md-nav__link">
-      References
+      Conclusion
+    </a>
+  </li>
+
+        
+      </ul>
+    </nav>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-4-2" type="checkbox" id="nav-4-2" >
+    <label class="md-nav__link" for="nav-4-2">
+      Big Data
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Big Data" data-md-level="2">
+      <label class="md-nav__title" for="nav-4-2">
+        <span class="md-nav__icon md-icon"></span>
+        Big Data
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/evolution/" class="md-nav__link">
+      Evolution and Architecure of Hadoop
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../big_data/tasks/" class="md-nav__link">
+      Conclusion
     </a>
   </li>
 
@@ -873,8 +885,8 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#sre-use-cases" class="md-nav__link">
-    SRE Use cases
+  <a href="#applications-in-sre-role" class="md-nav__link">
+    Applications in SRE role
   </a>
   
 </li>
@@ -1236,8 +1248,8 @@
 </li>
       
         <li class="md-nav__item">
-  <a href="#sre-use-cases" class="md-nav__link">
-    SRE Use cases
+  <a href="#applications-in-sre-role" class="md-nav__link">
+    Applications in SRE role
   </a>
   
 </li>
@@ -1359,7 +1371,7 @@ media-exp1.licdn.com is a domain used by Linkedin to serve static content</p>
 <ul>
 <li>https://learning.oreilly.com/library/view/the-art-of/9780134031408/ch23.html</li>
 </ul>
-<h2 id="sre-use-cases">SRE Use cases</h2>
+<h2 id="applications-in-sre-role">Applications in SRE role</h2>
 <ol>
 <li>SREs in coordination with the network team work on how to map users traffic to a particular site. 
 https://engineering.linkedin.com/blog/2017/05/trafficshift--load-testing-at-scale</li>