End of 10 is a campaign to move people over to Linux with Windows 10 support ending
(www.gamingonlinux.com)
Proton / wine is modern day magic
Most Windows only steam games work out of the box (you do have to enable it in the right click menu > Compatibility options, per game)
Games that use Anti-cheat aren't likely to work (it depends on the Anti-cheat used and how it's configured)
ProtonDB is a good resource for checking if/which games work, or fixes and workarounds
You can use proton or wine on non steam games, but that requires additional setup that I'm not familiar with