As far as I remember, python core roughly covers the content of both beginners and intermediate python. Only the advanced course went slightly further than python core. So it doesn't really matter which one you pick, but you might wanna skip ahead a bit when beginning with core, since it starts with the very basics the beginners course already covered. The only real difference I can come up with right now is the amount of comments in python core, which is significantly higher :)
flo i cant find the advanced course in the menu. what is the name of the course? is it only for premium?