Intro page update

courses/index.md

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 <img src="img/sos.png" width=200 >
 
-In early 2019, we started visiting campuses across India to recruit the best and brightest minds to ensure LinkedIn, and all the services that make up its complex technology stack are always available for everyone. This critical function at LinkedIn falls under the purview of the Site Engineering team and Site Reliability Engineers (SREs) who are Software Engineers specializing in reliability. SREs apply the principles of computer science and engineering to the design, development, and operation of computer systems: generally, large-scale, distributed ones.
+Site Reliability Engineers (SREs)  sits at the intersection of software engineering and systems engineering. While there are potentially infinite permutations and combinations of how infrastructure and software components can be put together to achieve an objective, focusing on foundational skills allows SREs to work with complex systems and software, regardless of whether these systems are proprietary, 3rd party, open systems, run on cloud/on-prem infrastructure, etc. Particularly important is to gain a deep understanding of how these areas of systems and infrastructure relate to each other and interact with each other. The combination of software and systems engineering skills is rare and is generally built over time with exposure to a wide variety of infrastructure, systems, and software. 
+
+SREs bring in engineering practices to keep the site up. Each distributed system is an agglomeration of many components. SREs validate business requirements, convert them to SLAs for each of the components that constitute the distributed system, monitor and measure adherence to SLAs, re-architect or scale out to mitigate or avoid SLA breaches, add these learnings as feedback to new systems or projects and thereby reduce operational toil. Hence SREs play a vital role right from the day 0 design of the system. 
+
+In early 2019, we started visiting campuses across India to recruit the best and brightest minds to make sure LinkedIn, and all the services that make up its complex technology stack are always available for everyone. This critical function at LinkedIn falls under the purview of the Site Engineering team and Site Reliability Engineers (SREs) who are Software Engineers, specialized in reliability. 
 
 As we continued on this journey we started getting a lot of questions from these campuses on what exactly the site reliability engineering role entails? And, how could someone learn the skills and the disciplines involved to become a successful site reliability engineer? Fast forward a few months, and a few of these campus students had joined LinkedIn either as interns or as full-time engineers to become a part of the Site Engineering team; we also had a few lateral hires who joined our organization who were not from a traditional SRE background. That's when a few of us got together and started to think about how we can onboard new graduate engineers to the Site Engineering team.
 
-There is a vast amount of resources scattered throughout the web on what the roles and responsibilities of SREs are, how to monitor site health, production incidents, define SLO/SLI, etc. But there are very few resources out there guiding someone on the basic skill sets one has to acquire as a beginner. Because of the lack of these resources, we felt that individuals have a tough time getting into open positions in the industry. We created the School Of SRE as a starting point for anyone wanting to build their career as an SRE.
+There are very few resources out there guiding someone on the basic skill sets one has to acquire as a beginner SRE. Because of the lack of these resources, we felt that individuals have a tough time getting into open positions in the industry. We created the School Of SRE as a starting point for anyone wanting to build their career as an SRE.
+In this course, we are focusing on building strong foundational skills. The course is structured in a way to provide more real life examples and how learning each of these topics can play an important role in day to day job responsibilities of an SRE. Currently we are covering the following topics under the School Of SRE:
+ 
+-   Level 101
+    -   Fundamentals Series
+        -   [Linux Basics](https://linkedin.github.io/school-of-sre/level101/linux_basics/intro/)
+        -   [Git](https://linkedin.github.io/school-of-sre/level101/git/git-basics/)
+        -   [Linux Networking](https://linkedin.github.io/school-of-sre/level101/linux_networking/intro/)
+    -   [Python and Web](https://linkedin.github.io/school-of-sre/level101/python_web/intro/)
+    -   Data
+        - [Relational databases(MySQL)](https://linkedin.github.io/school-of-sre/level101/databases_sql/intro/)
+        -   [NoSQL concepts](https://linkedin.github.io/school-of-sre/level101/databases_nosql/intro/)
+        -   [Big Data](https://linkedin.github.io/school-of-sre/level101/big_data/intro/)
+    -   [Systems Design](https://linkedin.github.io/school-of-sre/level101/systems_design/intro/)
+    -   [Metrics and Monitoring](https://linkedin.github.io/school-of-sre/level101/metrics_and_monitoring/introduction/)
+    -   [Security](https://linkedin.github.io/school-of-sre/level101/security/intro/)
 
-In this course, we are focusing on building strong foundational skills. The course is structured in a way to provide more real life examples and how learning each of these topics can play an important role in day to day SRE life. Currently we are covering the following topics under the School Of SRE:
-
--   Fundamentals Series
-    -   [Linux Basics](https://linkedin.github.io/school-of-sre/level101/linux_basics/intro/)
-    -   [Git](https://linkedin.github.io/school-of-sre/level101/git/git-basics/)
-    -   [Linux Networking](https://linkedin.github.io/school-of-sre/level101/linux_networking/intro/)
--   [Python and Web](https://linkedin.github.io/school-of-sre/level101/python_web/intro/)
--   Data
-    - [Relational databases(MySQL)](https://linkedin.github.io/school-of-sre/level101/databases_sql/intro/)
-    -   [NoSQL concepts](https://linkedin.github.io/school-of-sre/level101/databases_nosql/intro/)
-    -   [Big Data](https://linkedin.github.io/school-of-sre/level101/big_data/intro/)
--   [Systems Design](https://linkedin.github.io/school-of-sre/level101/systems_design/intro/)
--   [Metrics and Monitoring](https://linkedin.github.io/school-of-sre/level101/metrics_and_monitoring/introduction/)
--   [Security](https://linkedin.github.io/school-of-sre/level101/security/intro/)
+-   Level 102
+    -   Linux Advanced
+        -   [Containers and orchestration](https://linkedin.github.io/school-of-sre/level102/containerization_and_orchestration/intro/)
+    -   [Networking](https://linkedin.github.io/school-of-sre/level102/networking/introduction/)
+    -   [System Design](https://linkedin.github.io/school-of-sre/level102/system_design/intro/)
+    -   [System troubleshooting and performance improvements](https://linkedin.github.io/school-of-sre/level102/system_troubleshooting_and_performance/introduction/) 
 
 We believe continuous learning will help in acquiring deeper knowledge and competencies in order to expand your skill sets, every module has added references that could be a guide for further learning. Our hope is that by going through these modules we should be able to build the essential skills required for a Site Reliability Engineer.
 

courses/level102/system_design/intro.md

@@ -1,4 +1,4 @@
-# System Design Phase 2
+# System Design
 
 ## Prerequisites