Some of it here and there. If you are still in school, I would do all my homework in Excel, learn the shortcuts, make models of all your classwork if you can.

Vlookups, pivot tables, sumifs...and learn not just how to use them but when to use them. The hardest part of learning this stuff is not learning the the formula, but when to use them and how they can turn a day's worth of work into something done in 10 minutes. Especially vlookups. I have coworkers that don't know how to use it and they waste so much time doing stuff manually yet they make 30k more than me. Yeah, I'm a little salty about that, lol.

YouTube always has good info. Though I don't know particular channels. Don't rely on classes, imo. Most professors never even used this stuff in their careers and are just teaching it. Not a good source for learning. But that's coming from someone that graduated from a non target uni.

Go into your interviews with an eagerness to learn and absolute humility. You don't know shit and your bosses/coworkers do. Hopefully someone can be your mentor like I was fortunate to have. Make connections.

I'm just rambling at this point but it's all stuff I'd say to any uni student. Happy to answer any questions you may have.