[maroonblazer]

Also a classically trained, now jazz, musician and agree with all of this.

Neely is good. I'd also recommend Music Matters on YouTube. His style is very easy to understand once you know the basics of notes and chords. He explains many of the different ways chords can fit together. His Bach 'tear downs' are absolutely fantastic.

https://www.youtube.com/@MusicMattersGB

[Yeroc]

I second the Music Matters recommendation. The way he explains things and walks through the creation of various harmonies I find very illuminating.