There are many fields you could take a closer look, but it heavily depends on your personal preferences. Work you won't like is far more difficult to grasp and

There are many fields you could take a closer look, but it heavily depends on your personal preferences. Work you won't like is far more difficult to grasp and execute. I got a small part of knowledge from studying and a large parts in a laboratory with peers or by just dabbling in topics of interest. At that time I leaned heavily in low level systems programming. But that was probably because we had so many toys to play with at our university (which often received presents from large companies to draw students toward their tech). On the theoretical side I wouldn't pay any attention to the latest IT buzz, but looking into tensor algebra, number systems like quaternions and numerics in general have a very broad application in modern computing and I think university is a good place to take the time to lean into such topics. Not becoming an expert, but perhaps forming an understanding why and where such tools are applied.