Learn to organize (workplace, housing, etc. etc.). I'm not kidding. Way more important than any code-related skills you're learning in school from the POV of benefiting the proletariat, and something woefully lacking in most coders despite our coming proletarianization being obvious. You can join the IWW and they'll teach you for free.
Actual technical skills? Probably infosec stuff. Do CTFs, etc.
Very little of the rest of it is useful for proles in a world ruled by the bourgeoisie. And once that's not the case, just pursue what interests you in the same way you would any career as a software engineer because it'll all be useful. Could also look at emigrating to an AES state where that's already true.