Welcome! I think a big thing is to realize it is a bit different and try to stick with it a while you get comfortable.
I usually keep a copy if the original system file when I edit something. Basically things in /etc.
The Arch wiki is a great resource even if you’re not using Arch.
For gaming and the occasional Windows app, if I’m not using Proton through Steam I like Lutris. Over the last several years I’ve found Windows to be far less necessary though.
Also don’t be afraid to mix things installed from your distro’s repository with Flatpaks or AppImages. I use all three types of apps with no issues. I would avoid snaps if possible though. The last few times I tried them things just didn’t work well.