How to learn to understand code?

This has probably been asked a million times but wherever i search I can't quite get the answer I'm looking for. I've dipped my toes into game making a few times where every time I gave up when I couldn't understand, but this time I'd actually want to get past that point. I'm trying to make a small 2D coop RPG in Godot to get the hang of what I'd do next if people get interested, I was successful in syncing player movement in multiple instances but