imo abstract algebra is pretty much the gateway to most modern math. it well feel at first like it's a lot of machinery without purpose, but understanding group

imo abstract algebra is pretty much the gateway to most modern math. it well feel at first like it's a lot of machinery without purpose, but understanding groups rings and fields well opens the door to topology, advanced number theory and a bunch of the rest of math. the other option would be to learn some real and complex analysis, but imo the algebra side is where a lot more of the cool stuff is.