plz help i dont get what a demo is nor could I record one, what is a demo and how do I make one?

What kind of demo are you trying to record? What exactly do you want to record?

oof that yt channel

Quality content XD but seriously, if you’re talking about a source engine game, then there are demo recorders that are easy to set up

Fruity Loops or Pro Tools are solid platforms if you're making your demo tape. You may want to lease a few beats too unless you're a good producer. For that, Soundclick is a good place to start. Good luck!