I mean, as a millennial, I mostly taught myself to type. I’m fast enough, but have bad technique and could be faster. I was only ever actually trained to type in grade school, and barely. Once in a while in computer class we would play an educational typing game.
My mom is much better at typing than I am, because she was trained to type in college. That’s not really a thing anymore.
I’ve been using Linux desktop as a daily driver for a little under 10 years now and I’m still discovering ways I could be doing things better. There isn’t some magic tutorial that somebody can give you here which will suddenly have you as competent with Linux as you are with Windows. Try things, break things, when things break, look into what you can do to fix them. Keep system snapshots and backups of your personal files so you don’t have any data loss if things go wrong. And snapshots are useful for unfucking a system that you’ve just fucked.
Sorry if you don’t want to hear this, but you kinda have to figure it out yourself. Thankfully, for specific issues and questions, there is a ton of material out there, and people are generally pretty happy to help.