Couch-based Linux 'GamerOS' shows how SteamOS could be done - with a new release up
While SteamOS had a nice idea to bring Linux gaming to the living room, it's currently on hold (although Valve may return to it). Now, there's another choice with the simply named GamerOS.
How to setup OpenMW for modern Morrowind on Linux / SteamOS and Steam Deck
How to install Hollow Knight: Silksong mods on Linux, SteamOS and Steam Deck