There's a new Godot Engine addon to simplify testing on Steam Deck
For game developers using or looking at using Godot Engine, you may want to check out the Godot 4 DeployToSteamOS addon which gives you a one-click method to test your games on Steam Deck.
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