My gaming system runs Debian Stable. (AMD GPU, Sony game controller, steam-devices and pipewire installed.)
Steam games work fine.
Flatpaks (e.g. emulators) work fine.
GOG games mostly work fine. The few problems I have encountered were fixed by either installing missing libraries or renaming out-of-date ones that shipped with the game.
You haven’t described your system or stated what errors you’re struggling with, and nobody can help you without that information, but chances are they can be fixed if you take the time to understand them.
Edit: BTW, You might want to check out Lutris, if it covers games that you play. There’s nothing magic about it, but some people find it useful as a time/effort saver.