Just got an email about this from the Pouch app. First I've heard of Udemy so I had a quick look. I'm considering some in the writing field but there are loads of music based courses. Guitar, piano, harmonica, production, technology etc.
I can't vouch for the quality (so approach with a justified skepticism) but it's worth a look and may be of interest to some Fretboarders.https://www.udemy.com/
Just so you know I have no affiliation whatsoever with Udemy