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Re:Coltrane: A music theory library with a command-line inte... by lst68 on Saturday March 11, 2023 @02:23PM (#35111684)
Rick Beato also has a book and interactive courses that are on sale at the moment: https://rickbeato.com/ (I have bought the bundle, but I haven't had time to check it out yet.)

An other useful channel I can recommend is https://www.youtube.com/@DavidBennettPiano

Re:Coltrane: A music theory library with a command-line inte... by gramie on Saturday March 11, 2023 @03:59PM (#35112644)
Don't feel rushed, Rick's content is always on sale. I don't have first-hand knowledge, but have read some criticisms that the "Beato Book" is not always coherent or well organized. That said, I believe he has recently made substantial revisions, and added a lot of on-line content.

Probably not the worst way to spend ~$100!