hooktheory.com
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Hooktheory is an interactive music-theory platform for learning chords and harmony. It offers theory lessons, chord-function explanations, and an extensive library of pop-song progressions with interactive diagrams to analyze and create progressions.
More resources on Chords & Harmony
Jazz Improvisation (Gary Burton / Berklee / Coursera)
Gary Burton brings Berklee's core jazz curriculum to anyone with an internet connection — free to audit. Covers jazz improvisation foundations and chord-scale relationships.
Charles Cornell
Purchase College jazz piano graduate combining comedy with genuine music education. His '5 Versions' series makes reharmonisation and chord substitution surprisingly accessible. ~1.4M subscribers.
Aimee Nolte Music
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Jazz Tutorial with Julian Bradley
The most comprehensive free jazz piano education on YouTube — voicings, improvisation, and jazz scales with a structured step-by-step approach. Master's in music composition. ~418K subscribers.
Bill Hilton Piano
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PianoGroove
Structured jazz piano instruction online — one of the most comprehensive resources for adults learning jazz harmony and voicings at the keyboard.