Install Steam

Also enable Proton for everything. I thought that was the default, but I recently reinstalled Linux on my laptop (wanted to try out openSUSE Aeon) and was surprised that at least on the flatpak, Proton isn't enabled by default.

That covers like 90% of Steam games, and 95% of what a typical SP-only gamer would need. However, MP games w/ anti-cheat are still an issue, but the more people that switch to Linux, the more likely devs are to support anti-cheat games on Linux.