Steam Community :: Guide :: Adding a Non-Steam Game to Your Library

I will give you instructions on how to add an application or game to your Steam library that was not purchased or activated through Steam.

Steam Community :: Guide :: Steam Deck Controller Guide - A Visual Introduction

Steam Community :: Guide :: Run Games from Battlenet Launcher with Steam Overlay

SGDBoop: Adding Artwork to Steam and Non-Steam Games Easy - Steam Deck HQ

Steam Community :: Guide :: Steam Deck Controller Guide - A Visual Introduction

The Steam Deck's button mapper is the best feature you're not using

How to add external games to your Steam library

Steam Community :: Guide :: Contributing Screenshots, Artwork and Videos to the Steam Community

Steam Community (Steamworks Documentation)

How to Move PC Games to a New Drive: Steam, Origin, Windows Store, Epic Games, Battle.net & GOG

Steam says that this game is running but I can't see it, it is also not popping up in the task manager, does anyone have a solution to this? : r/ Steam