Hey there. As someone in Uni who relies very much on your videos, thank you so much, you people are a godsend. 

My request would be the following: The problem I ran into was that I jump around in courses a lot, as I usually only need parts of one course, and then parts from another. And fast navigation is sometimes an issue. 
Hence, I would find it great, if (1) you could put more than those 9 courses on the main page and (2) if you could specifically mark subchapters, such as "Vectors" in Precalculus, or (3) even let people put all the specific subchapters instead of the courses on the main page.

Thank you very much for reading. 
Stay healthy all you people out there :-)