There's a bunch of technical skills you should have, and I'm sure people will suggest some good resources. But there's other skills as well, about how to think about solving problems, and planning your career, and prioritization that you also need.

I've been writing up all the mistakes I've made as a software engineer for the past 20 years so other programmers can avoid them. A lot of them fall into that second category, turns out. Some technical stuff too, of course. Check out https://softwareclown.com if you're interested.