While the single-player sandbox is great for learning, the game truly shines in multiplayer and with community mods: Guide :: Gmod: How to have fun - Steam Community
: You can save your creations or download "Duplicates" (Dupes) made by other players through the Steam Workshop. Multiplayer and Add-ons Garryho mod
: Use WASD to move, Space to jump, and Shift to sprint. While the single-player sandbox is great for learning,
The core of GMod is building. You can start by spawning basic props and "welding" them together using the to create cars, rockets, or even complex robots. Space to jump