Check out Syncthing. It works pretty painlessly.

Gaming works surprisingly well. The last few years have made it a one-click affair for thousands of games with the efforts of the Proton team.

Mostly play indie top-down retro stuff like Core Keeper, but the occasional bout of Halo MCC/Infinite, RDR2, Wasteland 3, and a few others.

If the new Battlebit release anti-cheat functions properly under Proton then I’ll be picking that up.