1. As others have said, it’s possible to play most steam games, but not all. You have to decide if you like those games more than you dislike MS and Goo. I find there’s so many great games out there that I’ll never get to all of them, so I’m ok with dropping some bangers that usually want too much access to my system.
2. Here’s a useful resource if you need to understand slightly technical linux foundations https://linuxjourney.com/ It might not be necessary but it does help to have a foundational understanding, and honestly, the command line is awesome, powerful, and one of my favorite things about linux. Beyond having a basic understanding (and maybe having one of the books the site recommends on hand), before going to an LLM as others have suggested, have official sources of various components bookmarked and go there first. There’s so much BS out there now, I actually like the fact that I can read technical documentation, test it out, and know if it’s true.

one other tip: I’d recommend some kind of personal knowledge management (PKM) system to take notes. Linux gives you a lot of freedom-- that’s what’s great about it-- it can be complex and have a learning curve at times. It’s absolutely worth it though. It’s a totally different paradigm than windows. After a while you can really start crafting the whole system to your needs as an individual. I’m 3 years in and was using my first setup that whole time, i didn’t realize how customized I had made it until trying to set it up exactly on a new workstation. Now I’m writing a script so to automate my setup (os settings, program installs, configs) by running a single command. Then I can really start experimenting.

Everybody’s different and with a little basic knowledge, everyone’s setup can be tweaked to their individual needs a little better than other “user friendly/polished” operating systems. I hope you find as much joy and freedom in it as I do.