Huge thanks to everyone who helped me learn GSC: Birchy, DoktorSAS, FutureRave and other people on Discord.
Special thanks to DoktorSAS for helping me a lot on S1X.

How do I download a script?

Click on a .gsc file and click on Raw.

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Right click anywhere and click on Save page as (or an equivalent).

Make sure to put All or Any for the file type and to add .gsc at the end of the file name.

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How do I use a script?

Go inside your game folder then go in s1x\scripts and drop a .gsc file there.

Note that you can use map_restart in the console to quickly restart your current game and reload scripts.