There are two things you want to learn:

First is how to act safely in a big group. You want to be safe and consistent and learn how to move around. Do a couple of crits with the idea of sitting at the back at watching the surges and people doing stupid stuff. Watching somebody dive into the corner and screw it up teaches you not to do that.

Second is the mental game. You should try to figure out when attacks happen and why. Being a strong rider means you can recover from missing something and not be out of the race. So per race you get to see and experience more.

Go race and learn what works and what doesn't for yourself and for other people.