Honestly, if you’re mostly using Steam for gaming, pretty much any major distro will work. Linux Mint is my personal choice for newbies but if something else strikes your fancy, go for it. I second the recommendation for checking on ProtonDB to see if your games are supported. I would also recommend ProtonUp-Qt as a program once you’ve installed Linux; it’s really good for managing different Proton installs on Steam quickly and easily. Also also, I have personally had better luck with the Flatpak version of Steam, rather than the native distro versions, because it has less weird dependency issues, but YMMV. Good luck!
Honestly, if you’re mostly using Steam for gaming, pretty much any major distro will work. Linux Mint is my personal choice for newbies but if something else strikes your fancy, go for it. I second the recommendation for checking on ProtonDB to see if your games are supported. I would also recommend ProtonUp-Qt as a program once you’ve installed Linux; it’s really good for managing different Proton installs on Steam quickly and easily. Also also, I have personally had better luck with the Flatpak version of Steam, rather than the native distro versions, because it has less weird dependency issues, but YMMV. Good luck!