diff --git a/404.html b/404.html
index 095dfeb..0a25678 100644
--- a/404.html
+++ b/404.html
@@ -159,11 +159,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="/linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="/linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="/linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -218,13 +279,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/big_data/architecture/index.html b/big_data/architecture/index.html
index b4f7dca..341d9aa 100644
--- a/big_data/architecture/index.html
+++ b/big_data/architecture/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/big_data/evolution/index.html b/big_data/evolution/index.html
index b12546f..653fe40 100644
--- a/big_data/evolution/index.html
+++ b/big_data/evolution/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/big_data/intro/index.html b/big_data/intro/index.html
index b15a827..5bb11e6 100644
--- a/big_data/intro/index.html
+++ b/big_data/intro/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/big_data/overview/index.html b/big_data/overview/index.html
index 22e73a5..b9c3bd3 100644
--- a/big_data/overview/index.html
+++ b/big_data/overview/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/big_data/tasks/index.html b/big_data/tasks/index.html
index d35ee49..c4f3653 100644
--- a/big_data/tasks/index.html
+++ b/big_data/tasks/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/big_data/usage/index.html b/big_data/usage/index.html
index dd37806..4fbd619 100644
--- a/big_data/usage/index.html
+++ b/big_data/usage/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/git/branches/index.html b/git/branches/index.html
index 98ad098..b9dd673 100644
--- a/git/branches/index.html
+++ b/git/branches/index.html
@@ -161,18 +161,79 @@
           
           
 
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
+    <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-1" type="checkbox" id="nav-2-1" checked>
-    <label class="md-nav__link" for="nav-2-1">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" checked>
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -265,13 +326,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/git/git-basics/index.html b/git/git-basics/index.html
index 73fb868..d910ce5 100644
--- a/git/git-basics/index.html
+++ b/git/git-basics/index.html
@@ -161,18 +161,79 @@
           
           
 
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
+    <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-1" type="checkbox" id="nav-2-1" checked>
-    <label class="md-nav__link" for="nav-2-1">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" checked>
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -375,13 +436,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
@@ -1202,7 +1263,7 @@ spatel1-mn1:school-of-sre spatel1$ git log --oneline --graph
     <div class="md-footer-nav">
       <nav class="md-footer-nav__inner md-grid" aria-label="Footer">
         
-          <a href="../.." class="md-footer-nav__link md-footer-nav__link--prev" rel="prev">
+          <a href="../../linux_basics/linux_server_administration/" 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>
@@ -1211,7 +1272,7 @@ spatel1-mn1:school-of-sre spatel1$ git log --oneline --graph
                 <span class="md-footer-nav__direction">
                   Previous
                 </span>
-                Home
+                Server Administration
               </div>
             </div>
           </a>
diff --git a/git/github-hooks/index.html b/git/github-hooks/index.html
index 37eac96..89eedbe 100644
--- a/git/github-hooks/index.html
+++ b/git/github-hooks/index.html
@@ -161,18 +161,79 @@
           
           
 
+
+  <li class="md-nav__item md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
+    <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-1" type="checkbox" id="nav-2-1" checked>
-    <label class="md-nav__link" for="nav-2-1">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" checked>
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -272,13 +333,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/index.html b/index.html
index 891d5b5..5c662b4 100644
--- a/index.html
+++ b/index.html
@@ -173,11 +173,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -232,13 +293,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
@@ -776,13 +837,13 @@ Early 2019, we started visiting campuses to recruit the brightest minds to ensur
       <nav class="md-footer-nav__inner md-grid" aria-label="Footer">
         
         
-          <a href="git/git-basics/" class="md-footer-nav__link md-footer-nav__link--next" rel="next">
+          <a href="linux_basics/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>
-                Git Basics
+                Introduction
               </div>
             </div>
             <div class="md-footer-nav__button md-icon">
diff --git a/linux_basics/command_line_basics/index.html b/linux_basics/command_line_basics/index.html
index e0733ad..a91bc62 100644
--- a/linux_basics/command_line_basics/index.html
+++ b/linux_basics/command_line_basics/index.html
@@ -14,7 +14,7 @@
     
     
       
-        <title>Command Line Basics - SchoolOfSRE</title>
+        <title>Commandline Basics - SchoolOfSRE</title>
       
     
     
@@ -86,7 +86,7 @@
           </span>
           <span class="md-header-nav__topic md-ellipsis">
             
-              Command Line Basics
+              Commandline Basics
             
           </span>
         </div>
@@ -139,10 +139,12 @@
       
       
 
+  
 
-  <li class="md-nav__item md-nav__item--nested">
+
+  <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2" type="checkbox" id="nav-2" >
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2" type="checkbox" id="nav-2" checked>
     <label class="md-nav__link" for="nav-2">
       Fundamentals Series
       <span class="md-nav__icon md-icon"></span>
@@ -159,16 +161,295 @@
           
           
 
+  
+
+
+  <li class="md-nav__item md-nav__item--active md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" checked>
+    <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </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">
+        Commandline Basics
+        <span class="md-nav__icon md-icon"></span>
+      </label>
+    
+    <a href="./" class="md-nav__link md-nav__link--active">
+      Commandline Basics
+    </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="#what-is-a-command" class="md-nav__link">
+    What is a command ?
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#file-system-organization" class="md-nav__link">
+    File System Organization
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#commands-for-navigating-the-file-system" class="md-nav__link">
+    Commands for Navigating the File System
+  </a>
+  
+    <nav class="md-nav" aria-label="Commands for Navigating the File System">
+      <ul class="md-nav__list">
+        
+          <li class="md-nav__item">
+  <a href="#pwd-print-working-directory" class="md-nav__link">
+    pwd (print working directory)
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#cd-change-directory" class="md-nav__link">
+    cd (change directory)
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#ls-list-files-and-directories" class="md-nav__link">
+    ls (list files and directories)**
+  </a>
+  
+</li>
+        
+      </ul>
+    </nav>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#commands-for-manipulating-files" class="md-nav__link">
+    Commands for Manipulating Files
+  </a>
+  
+    <nav class="md-nav" aria-label="Commands for Manipulating Files">
+      <ul class="md-nav__list">
+        
+          <li class="md-nav__item">
+  <a href="#touch-create-new-file" class="md-nav__link">
+    touch (create new file)
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#mkdir-create-new-directories" class="md-nav__link">
+    mkdir (create new directories)
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#rm-delete-files-and-directories" class="md-nav__link">
+    rm (delete files and directories)
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#cp-copy-files-and-directories" class="md-nav__link">
+    cp (copy files and directories)
+  </a>
+  
+</li>
+        
+      </ul>
+    </nav>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#commands-for-viewing-files" class="md-nav__link">
+    Commands for Viewing Files
+  </a>
+  
+    <nav class="md-nav" aria-label="Commands for Viewing Files">
+      <ul class="md-nav__list">
+        
+          <li class="md-nav__item">
+  <a href="#cat" class="md-nav__link">
+    cat
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#head" class="md-nav__link">
+    head
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#tail" class="md-nav__link">
+    tail
+  </a>
+  
+</li>
+        
+      </ul>
+    </nav>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#echo-command-in-linux" class="md-nav__link">
+    Echo Command in Linux
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#text-processing-commands" class="md-nav__link">
+    Text Processing Commands
+  </a>
+  
+    <nav class="md-nav" aria-label="Text Processing Commands">
+      <ul class="md-nav__list">
+        
+          <li class="md-nav__item">
+  <a href="#grep" class="md-nav__link">
+    grep
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#sed" class="md-nav__link">
+    sed
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#sort" class="md-nav__link">
+    sort
+  </a>
+  
+</li>
+        
+      </ul>
+    </nav>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#io-redirection" class="md-nav__link">
+    I/O Redirection
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#applications-in-sre-role" class="md-nav__link">
+    Applications in SRE Role
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#useful-courses-and-tutorials" class="md-nav__link">
+    Useful courses and tutorials
+  </a>
+  
+</li>
+      
+    </ul>
+  
+</nav>
+    
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-1" type="checkbox" id="nav-2-1" >
-    <label class="md-nav__link" for="nav-2-1">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +504,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
@@ -1281,6 +1562,41 @@ prints the unique numbers from the input.</p>
         
 <footer class="md-footer">
   
+    <div class="md-footer-nav">
+      <nav class="md-footer-nav__inner md-grid" aria-label="Footer">
+        
+          <a href="../intro/" 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>
+                Introduction
+              </div>
+            </div>
+          </a>
+        
+        
+          <a href="../linux_server_administration/" 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>
+                Server Administration
+              </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">
diff --git a/linux_basics/intro/index.html b/linux_basics/intro/index.html
index d101516..fa6cf99 100644
--- a/linux_basics/intro/index.html
+++ b/linux_basics/intro/index.html
@@ -139,10 +139,12 @@
       
       
 
+  
 
-  <li class="md-nav__item md-nav__item--nested">
+
+  <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2" type="checkbox" id="nav-2" >
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2" type="checkbox" id="nav-2" checked>
     <label class="md-nav__link" for="nav-2">
       Fundamentals Series
       <span class="md-nav__icon md-icon"></span>
@@ -159,16 +161,180 @@
           
           
 
+  
+
+
+  <li class="md-nav__item md-nav__item--active md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" checked>
+    <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+  
+
+
+  <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">
+        Introduction
+        <span class="md-nav__icon md-icon"></span>
+      </label>
+    
+    <a href="./" class="md-nav__link md-nav__link--active">
+      Introduction
+    </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="#pre-reads" class="md-nav__link">
+    Pre - Reads
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#what-to-expect-from-this-training" class="md-nav__link">
+    What to expect from this training
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#what-is-not-covered-under-this-training" class="md-nav__link">
+    What is not covered under this training
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#training-content" class="md-nav__link">
+    Training Content
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#what-are-linux-operating-systems" class="md-nav__link">
+    What are Linux operating systems
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#what-are-popular-linux-distributions" class="md-nav__link">
+    What are popular Linux distributions
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#linux-architecture" class="md-nav__link">
+    Linux Architecture
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#uses-of-linux-operating-systems" class="md-nav__link">
+    Uses of Linux Operating Systems
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#graphical-user-interface-gui-vs-command-line-interface-cli" class="md-nav__link">
+    Graphical user interface (GUI) vs Command line interface (CLI)
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#shell-vs-terminal" class="md-nav__link">
+    Shell vs Terminal
+  </a>
+  
+</li>
+      
+    </ul>
+  
+</nav>
+    
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-1" type="checkbox" id="nav-2-1" >
-    <label class="md-nav__link" for="nav-2-1">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +389,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
@@ -998,6 +1164,41 @@ commands from the user.</p>
         
 <footer class="md-footer">
   
+    <div class="md-footer-nav">
+      <nav class="md-footer-nav__inner md-grid" aria-label="Footer">
+        
+          <a href="../.." 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>
+                Home
+              </div>
+            </div>
+          </a>
+        
+        
+          <a href="../command_line_basics/" 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>
+                Commandline Basics
+              </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">
diff --git a/linux_basics/linux_server_administration/index.html b/linux_basics/linux_server_administration/index.html
index 8b6cf48..51e79f8 100644
--- a/linux_basics/linux_server_administration/index.html
+++ b/linux_basics/linux_server_administration/index.html
@@ -14,7 +14,7 @@
     
     
       
-        <title>Linux Server Administration - SchoolOfSRE</title>
+        <title>Server Administration - SchoolOfSRE</title>
       
     
     
@@ -86,7 +86,7 @@
           </span>
           <span class="md-header-nav__topic md-ellipsis">
             
-              Linux Server Administration
+              Server Administration
             
           </span>
         </div>
@@ -139,10 +139,12 @@
       
       
 
+  
 
-  <li class="md-nav__item md-nav__item--nested">
+
+  <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2" type="checkbox" id="nav-2" >
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2" type="checkbox" id="nav-2" checked>
     <label class="md-nav__link" for="nav-2">
       Fundamentals Series
       <span class="md-nav__icon md-icon"></span>
@@ -159,16 +161,410 @@
           
           
 
+  
+
+
+  <li class="md-nav__item md-nav__item--active md-nav__item--nested">
+    
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" checked>
+    <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </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">
+    <a href="../command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </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">
+        Server Administration
+        <span class="md-nav__icon md-icon"></span>
+      </label>
+    
+    <a href="./" class="md-nav__link md-nav__link--active">
+      Server Administration
+    </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="#lab-environment-setup" class="md-nav__link">
+    Lab Environment Setup
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#multi-user-operating-systems" class="md-nav__link">
+    Multi-User Operating Systems
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#usergroup-management-in-linux" class="md-nav__link">
+    User/Group Management in Linux
+  </a>
+  
+    <nav class="md-nav" aria-label="User/Group Management in Linux">
+      <ul class="md-nav__list">
+        
+          <li class="md-nav__item">
+  <a href="#id-command-in-linux" class="md-nav__link">
+    id command in linux
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#important-files-associated-with-usersgroups" class="md-nav__link">
+    Important files associated with users/groups
+  </a>
+  
+</li>
+        
+      </ul>
+    </nav>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#important-commands-for-managing-users" class="md-nav__link">
+    Important commands for managing users
+  </a>
+  
+    <nav class="md-nav" aria-label="Important commands for managing users">
+      <ul class="md-nav__list">
+        
+          <li class="md-nav__item">
+  <a href="#useradd" class="md-nav__link">
+    useradd
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#passwd" class="md-nav__link">
+    passwd
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#usermod" class="md-nav__link">
+    usermod
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#userdel" class="md-nav__link">
+    userdel
+  </a>
+  
+</li>
+        
+      </ul>
+    </nav>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#important-commands-for-managing-groups" class="md-nav__link">
+    Important commands for managing groups
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#becoming-a-superuser-in-linux" class="md-nav__link">
+    Becoming a Superuser in Linux
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#file-permissions-in-linux" class="md-nav__link">
+    File Permissions in Linux
+  </a>
+  
+    <nav class="md-nav" aria-label="File Permissions in Linux">
+      <ul class="md-nav__list">
+        
+          <li class="md-nav__item">
+  <a href="#chmod-command-in-linux" class="md-nav__link">
+    Chmod command in linux
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#chown-command-in-linux" class="md-nav__link">
+    Chown command in linux
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#chgrp-command-in-linux" class="md-nav__link">
+    Chgrp command in linux
+  </a>
+  
+</li>
+        
+      </ul>
+    </nav>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#ssh-command" class="md-nav__link">
+    SSH Command
+  </a>
+  
+    <nav class="md-nav" aria-label="SSH Command">
+      <ul class="md-nav__list">
+        
+          <li class="md-nav__item">
+  <a href="#passwordless-authentication-using-ssh" class="md-nav__link">
+    Passwordless Authentication Using SSH
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#how-to-run-commands-on-a-remote-host" class="md-nav__link">
+    How to run commands on a remote host ?
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#how-to-transfer-files-from-one-host-to-another-host" class="md-nav__link">
+    How to transfer files from one host to another host ?
+  </a>
+  
+</li>
+        
+      </ul>
+    </nav>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#package-management" class="md-nav__link">
+    Package Management
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#process-management" class="md-nav__link">
+    Process Management
+  </a>
+  
+    <nav class="md-nav" aria-label="Process Management">
+      <ul class="md-nav__list">
+        
+          <li class="md-nav__item">
+  <a href="#ps-process-status" class="md-nav__link">
+    ps (process status)
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#top" class="md-nav__link">
+    top
+  </a>
+  
+</li>
+        
+      </ul>
+    </nav>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#memory-management" class="md-nav__link">
+    Memory Management
+  </a>
+  
+    <nav class="md-nav" aria-label="Memory Management">
+      <ul class="md-nav__list">
+        
+          <li class="md-nav__item">
+  <a href="#free" class="md-nav__link">
+    free
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#vmstat" class="md-nav__link">
+    vmstat
+  </a>
+  
+</li>
+        
+      </ul>
+    </nav>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#checking-disk-space-in-linux" class="md-nav__link">
+    Checking Disk Space in Linux
+  </a>
+  
+    <nav class="md-nav" aria-label="Checking Disk Space in Linux">
+      <ul class="md-nav__list">
+        
+          <li class="md-nav__item">
+  <a href="#df-disk-free" class="md-nav__link">
+    df (disk free)
+  </a>
+  
+</li>
+        
+          <li class="md-nav__item">
+  <a href="#du-disk-usage" class="md-nav__link">
+    du (disk usage)
+  </a>
+  
+</li>
+        
+      </ul>
+    </nav>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#daemons" class="md-nav__link">
+    Daemons
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#systemd" class="md-nav__link">
+    Systemd
+  </a>
+  
+    <nav class="md-nav" aria-label="Systemd">
+      <ul class="md-nav__list">
+        
+          <li class="md-nav__item">
+  <a href="#managing-system-services" class="md-nav__link">
+    Managing System Services
+  </a>
+  
+</li>
+        
+      </ul>
+    </nav>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#logs" class="md-nav__link">
+    Logs
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#applications-in-sre-role" class="md-nav__link">
+    Applications in SRE Role
+  </a>
+  
+</li>
+      
+        <li class="md-nav__item">
+  <a href="#useful-courses-and-tutorials" class="md-nav__link">
+    Useful courses and tutorials
+  </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-2-1" type="checkbox" id="nav-2-1" >
-    <label class="md-nav__link" for="nav-2-1">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +619,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
@@ -1635,6 +2031,41 @@ the system.</p>
         
 <footer class="md-footer">
   
+    <div class="md-footer-nav">
+      <nav class="md-footer-nav__inner md-grid" aria-label="Footer">
+        
+          <a href="../command_line_basics/" 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>
+                Commandline Basics
+              </div>
+            </div>
+          </a>
+        
+        
+          <a href="../../git/git-basics/" 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>
+                Git Basics
+              </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">
diff --git a/linux_networking/dns/index.html b/linux_networking/dns/index.html
index d0abaf7..357b411 100644
--- a/linux_networking/dns/index.html
+++ b/linux_networking/dns/index.html
@@ -166,11 +166,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -227,13 +288,13 @@
 
   <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" checked>
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" checked>
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/linux_networking/http/index.html b/linux_networking/http/index.html
index 4d86444..b43be59 100644
--- a/linux_networking/http/index.html
+++ b/linux_networking/http/index.html
@@ -166,11 +166,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -227,13 +288,13 @@
 
   <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" checked>
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" checked>
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/linux_networking/intro/index.html b/linux_networking/intro/index.html
index 2d406e3..8bf7698 100644
--- a/linux_networking/intro/index.html
+++ b/linux_networking/intro/index.html
@@ -166,11 +166,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -227,13 +288,13 @@
 
   <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" checked>
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" checked>
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/linux_networking/ipr/index.html b/linux_networking/ipr/index.html
index 712c37a..6ba431f 100644
--- a/linux_networking/ipr/index.html
+++ b/linux_networking/ipr/index.html
@@ -166,11 +166,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -227,13 +288,13 @@
 
   <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" checked>
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" checked>
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/linux_networking/tcp/index.html b/linux_networking/tcp/index.html
index 4ab2077..69d214e 100644
--- a/linux_networking/tcp/index.html
+++ b/linux_networking/tcp/index.html
@@ -166,11 +166,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -227,13 +288,13 @@
 
   <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" checked>
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" checked>
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/linux_networking/udp/index.html b/linux_networking/udp/index.html
index c946ad1..e9ba2ba 100644
--- a/linux_networking/udp/index.html
+++ b/linux_networking/udp/index.html
@@ -166,11 +166,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -227,13 +288,13 @@
 
   <li class="md-nav__item md-nav__item--active md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" checked>
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" checked>
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/python_web/intro/index.html b/python_web/intro/index.html
index aca4e57..5bba506 100644
--- a/python_web/intro/index.html
+++ b/python_web/intro/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/python_web/python-concepts/index.html b/python_web/python-concepts/index.html
index 250f442..4ac019e 100644
--- a/python_web/python-concepts/index.html
+++ b/python_web/python-concepts/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/python_web/python-web-flask/index.html b/python_web/python-web-flask/index.html
index 84bc534..8be3121 100644
--- a/python_web/python-web-flask/index.html
+++ b/python_web/python-web-flask/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/python_web/sre-conclusion/index.html b/python_web/sre-conclusion/index.html
index 5c371c4..7c91af3 100644
--- a/python_web/sre-conclusion/index.html
+++ b/python_web/sre-conclusion/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/python_web/url-shorten-app/index.html b/python_web/url-shorten-app/index.html
index 665335a..93283ed 100644
--- a/python_web/url-shorten-app/index.html
+++ b/python_web/url-shorten-app/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/security/fundamentals/index.html b/security/fundamentals/index.html
index fa4bc8c..2f0e5d0 100644
--- a/security/fundamentals/index.html
+++ b/security/fundamentals/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/security/intro/index.html b/security/intro/index.html
index 36c6c5e..ed1081d 100644
--- a/security/intro/index.html
+++ b/security/intro/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/security/network_security/index.html b/security/network_security/index.html
index 444cfd6..67b577e 100644
--- a/security/network_security/index.html
+++ b/security/network_security/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/security/threats_attacks_defences/index.html b/security/threats_attacks_defences/index.html
index 5398c57..78e263f 100644
--- a/security/threats_attacks_defences/index.html
+++ b/security/threats_attacks_defences/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/security/writing_secure_code/index.html b/security/writing_secure_code/index.html
index 6a72687..5cc5f03 100644
--- a/security/writing_secure_code/index.html
+++ b/security/writing_secure_code/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/sitemap.xml b/sitemap.xml
index e38a2e3..48b109a 100644
--- a/sitemap.xml
+++ b/sitemap.xml
@@ -123,5 +123,17 @@
      <loc>None</loc>
      <lastmod>2020-11-17</lastmod>
      <changefreq>daily</changefreq>
+    </url><url>
+     <loc>None</loc>
+     <lastmod>2020-11-17</lastmod>
+     <changefreq>daily</changefreq>
+    </url><url>
+     <loc>None</loc>
+     <lastmod>2020-11-17</lastmod>
+     <changefreq>daily</changefreq>
+    </url><url>
+     <loc>None</loc>
+     <lastmod>2020-11-17</lastmod>
+     <changefreq>daily</changefreq>
     </url>
 </urlset>
\ No newline at end of file
diff --git a/sitemap.xml.gz b/sitemap.xml.gz
index e2fc728..64eb91b 100644
Binary files a/sitemap.xml.gz and b/sitemap.xml.gz differ
diff --git a/systems_design/availability/index.html b/systems_design/availability/index.html
index d9955de..bf3546c 100644
--- a/systems_design/availability/index.html
+++ b/systems_design/availability/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/systems_design/conclusion/index.html b/systems_design/conclusion/index.html
index f73a4f2..84a05c4 100644
--- a/systems_design/conclusion/index.html
+++ b/systems_design/conclusion/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/systems_design/fault-tolerance/index.html b/systems_design/fault-tolerance/index.html
index 797b0f6..b931b64 100644
--- a/systems_design/fault-tolerance/index.html
+++ b/systems_design/fault-tolerance/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/systems_design/intro/index.html b/systems_design/intro/index.html
index 12ab5eb..eeb83df 100644
--- a/systems_design/intro/index.html
+++ b/systems_design/intro/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>
diff --git a/systems_design/scalability/index.html b/systems_design/scalability/index.html
index cb913c2..a0f6cd4 100644
--- a/systems_design/scalability/index.html
+++ b/systems_design/scalability/index.html
@@ -164,11 +164,72 @@
     
     <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-1" type="checkbox" id="nav-2-1" >
     <label class="md-nav__link" for="nav-2-1">
+      Linux Basics
+      <span class="md-nav__icon md-icon"></span>
+    </label>
+    <nav class="md-nav" aria-label="Linux Basics" data-md-level="2">
+      <label class="md-nav__title" for="nav-2-1">
+        <span class="md-nav__icon md-icon"></span>
+        Linux Basics
+      </label>
+      <ul class="md-nav__list" data-md-scrollfix>
+        
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/intro/" class="md-nav__link">
+      Introduction
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/command_line_basics/" class="md-nav__link">
+      Commandline Basics
+    </a>
+  </li>
+
+        
+          
+          
+          
+
+
+  <li class="md-nav__item">
+    <a href="../../linux_basics/linux_server_administration/" class="md-nav__link">
+      Server Administration
+    </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-2-2" type="checkbox" id="nav-2-2" >
+    <label class="md-nav__link" for="nav-2-2">
       Git
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Git" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-1">
+      <label class="md-nav__title" for="nav-2-2">
         <span class="md-nav__icon md-icon"></span>
         Git
       </label>
@@ -223,13 +284,13 @@
 
   <li class="md-nav__item md-nav__item--nested">
     
-    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-2" type="checkbox" id="nav-2-2" >
-    <label class="md-nav__link" for="nav-2-2">
+    <input class="md-nav__toggle md-toggle" data-md-toggle="nav-2-3" type="checkbox" id="nav-2-3" >
+    <label class="md-nav__link" for="nav-2-3">
       Linux Networking
       <span class="md-nav__icon md-icon"></span>
     </label>
     <nav class="md-nav" aria-label="Linux Networking" data-md-level="2">
-      <label class="md-nav__title" for="nav-2-2">
+      <label class="md-nav__title" for="nav-2-3">
         <span class="md-nav__icon md-icon"></span>
         Linux Networking
       </label>