How to ask for help.
The thing people get wrong: it's important to be able to say very specifically which piece you're not understanding, or what part of your code is breaking.
Here's THE long-standing article that addresses this in depth - in a way that applies to tech generally (beyond dev). Parts seem archaic. It's a Wiki, so overly wordy, etc. But still pretty great overall:
We’re a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.