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If you're a developer, read the source code. People will tell you how they remember things working, or how they think they should work. The code is what it is.
I don't know if that's obvious for people entering this profession but mind that you don't read code like a book. Check how the functions you use are implemented. What's being called from where (call stack helps in the debugger). How are experience programmers managing their code etc. It's a good skill to learn how to navigate other people code and quickly find the parts that matter
Exactly! Always push for code pointers for everything people tell you about the codebase. Even if the code has a bug and isn't working as intended, it's so important to know the actual truth if what's happening.