Sometimes you can find accompanying audio or video recordings from that semester or from a different sem (UC Berkeley does this), and personally following along with a lecture sequence makes studying advanced topics much easier.

I think this is just a list of resources that make self-studying easier by providing different resources for each topic.

It probably varies from course to course and I've only done Udacity stuff. There you get lectures and can do online exercises for free. If you pay $199 you get "Projects with reviews by a Coach - Stuck? Get 1:1 help from Coaches - Verified Certificate"