@blaaablaaaa @BigDawg869789 Also, if a game is not on Steam (or if it's just a regular Windows program), there is Wine which is what Proton is based on.
If you are into emulators, pretty much every emulator in existence is on Linux as most emulators are open-source. Though emulators for 6th gen home consoles and beyond are kind of hit or miss on Linux, at least from my experience.