I'm an undergraduate student, currently finishing up my first year. Unfortunately, my country's universities do not have many research opportunities, and thus I have virtually nothing to do as such in my summer. I've started teaching myself Python for now, but what else should I do? I was thinking of teaching myself classical mechanics from Marion&Thornton (we only had Newtonian Mechanics so far in sem 1). Does that seem like a good idea to keep my brain active? Thanks!