I'm new to cloud variables and wanted to know how to make a player slot system so i could set on player to player one, the next to player two etc.

Oh dear… this is extremely advanced stuff.

You may want to post the current progress on your project, and then we can narrow it down.

Also, I *highly* recommend creating some fully-fledged games (especially platformers and top-downs) so you get a better feel for the programming language. It'll make netcode scripting a LOT easier.

https://scratch.mit.edu/projects/77775784/ may help but bear in mind that cloud variables are more limited than they were when I created this. I'd suggest each user only updating one cloud variable 5 times asecond or so. The cloud servers will reject connections if variable updates are happening too quickly.