This is dumb. But just to talk corpo for a bit (because that is the reality for many of us): early in your career, putting in extra study time (or just making time on the clock if possible) will give you a leg up for certain kinds of white collar work. Just because you’ll know more.
But doing work on weekends will set you apart as a damned sucker who can be used by others to make career moves. So do that if you want to feel someone’s pump in your eye socket as they trample you to reach for their dream job.
You’re never going to get promoted to an easier job if you’ve proven you can build like 2x more widgets than your co-workers.
You’ll get to a better job by showing up with your co-workers to the boss’ house and asking nicely.