Imposter syndrome is real.

Kinda soon you'll be in a position where others look up to you, thinking they'll never get as good as you, while you still think you're a total noob.

If coding, don't do everything from scratch.

I've seen multiple people losing interest in their projects, because they didn't even really start them. It's almost always parsers, they (my old me included) write their own parsers for stuff and then lose interest in the idea behind it.