Walk That Bass runs a helpful Youtube channel for jazz lovers.
From improvisation to tuning systems, specific song tutorials, ear training, groove types, and much more, Walk That Bass’s Youtube includes most of what you need to be able to play jazz. While his primary instruments are piano and jazz, any musicians wanting to learn more about jazz will get a lot from his videos, especially the jazz genres and history playlist:
Walk That Bass also has a companion website!
This free companion website has so many free resources for learning the fundamentals of jazz piano; to comping in specific styles (using voicings by Thelonious Monk, Bud Powell, and others; to improv and chord progressions. Definitely check it out if you’re interested in learning more about jazz piano (I currently am too!)