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 An updated and curated list of selected readings to illustrate High Scalability, High Availability, High Stability, High Performance, and High Intelligence Back-end Designs. Concepts are explained in the articles of notable engineers and credible references. Case studies are taken from battle-tested systems those are serving millions to billions of users.
 
-#### What if your Back-end went slow :traffic_light:
-> Understand your problems: performance problem (slow for a single user) or scalability problem (fast for a single user but slow under heavy load) by reviewing [design principles](#principles). You can also check some [talks](#talks) of elite engineers from tech giants to see how they build and scale their systems.
+#### If your Back-end went slow :traffic_light:
+> Understand your problems: performance problem (slow for a single user) or scalability problem (fast for a single user but slow under heavy load) by reviewing some [design principles](#principles). You can also check some [talks](#talks) of engineers from tech giants to see how they build and scale their systems.
 
-#### What if your Back-end went down :construction:
+#### If your Back-end went down :construction:
 > "Even if you lose all one day, you can build all over again if you retain your calm!" - Thuan Pham, Vietnamese refugee, CTO of Uber Technologies Inc.
 
-#### For you, who is struggling through dark days :ocean:
-> Checking those [interview notes](#interview) and [architectures with diagrams](#architectures) to get a comprehensive view. Before designing your system on whiteboard, you must understand thoroughly fundamental building blocks (IPC, OSI, TCP/IP, DLM, etc). It is even better to take a course on Distributed Systems or Distributed Computing. Be brave and Keep fighting :fist: Good luck :four_leaf_clover:
+#### If you are preparing for a System Design interview :ocean:
+> Checking out some [interview notes](#interview) and [real-world architectures with completed diagrams](#architectures) to get a comprehensive view before designing your system on whiteboard. Keep fighting :fist: Good luck :four_leaf_clover:
 
 #### Community Power :mountain_cableway::aerial_tramway::mountain_cableway: