Help in GameMaker

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GameMaker Multiplayer Help Needed (Currently have a main coder, and a spriter)
How do I code in collisions to prevent the player from going off the map. (GML)
Hey guys I'm new and don't know if I should make a game ,well try to make a game and if u guys think so give me some suggestions or tell me if u guys would like small creations like a small project so yeah that's all
Hoi if somebody can try and help me and teach me how to use this game engine please contact me I’m really struggling I really want this game to come to life ;-;

Hello, can somebody do this creatures model for a fnaf fangame??

Can someone give me the sound wave of this song?
Tales on Emesert Island - Nothing
Not doing it straight away, but how does one handle releasing a demo on this site?