As a novice mobile engineer I might go to stack overflow to see how to implement things like exception handling, caching, etc. I'd like to know the best way to

As a novice mobile engineer I might go to stack overflow to see how to implement things like exception handling, caching, etc. I'd like to know the best way to do these things, given your corpus of data. Decompile snippets of code from the most popular mobile apps and show me how they do all these things that everyone has to do.