https://github.com/donnemartin/system-design-primer https://github.com/donnemartin/system-design-primer This is geared for interview prep but I found it a very

https://github.com/donnemartin/system-design-primer https://github.com/donnemartin/system-design-primer This is geared for interview prep but I found it a very concise overview of how to build many kinds of apps.