How do you play garrys mod

You play Garry's Mod by creating contraptions such as a car using the tools in the spawn menu. You can open the spawn menu by pressing "Q" You can also pose ragdolls to make funny pictures. Also, you can make NPC battles. NPC means "Non Player Character" So you can make characters from Half-life 2 or other games in this and fight them or make them fight each other.

Garry's Mod is like a lot of other games people play. You can shoot things, you can move around, etc.