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
Fundamentals of Music Theory
This course, revised in 2022, will introduce you to the theory of music, providing you with the skills needed to read and write Western music notation, as well as to understand, analyse, and listen informedly. It will cover material such as pitches and scales, intervals, clefs, rhythm, form, metre and time signatures, phrases and cadences, and basic harmony. This course covers the fundamentals of Western music theory, from the absolute basics to some more advanced concepts. As such, it delivers material for beginners and offers much to experienced musicians alike. Learners can apply for Financial Aid directly with Coursera to assist with the cost of accessing the full course and gaining a certificate for successfully completing the course.
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.
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.
Jazz Keyboard Harmony by Phil DeGreg
Systematic voicing practice for jazz pianists — the essential companion to Mark Levine's Jazz Piano Book for developing harmonic vocabulary at the keyboard.
The Jazz Piano Book by Mark Levine
The bible of jazz piano — voicings, comping, stride, block chords, and improvisation in 300+ pages (Sher Music). Required at universities worldwide. Jazz piano demands its own curriculum; start here.
musictheory.net
Musictheory.net is a free, interactive platform for learning music theory, offering concise lessons on intervals, chords, scales, rhythm, and notation. It also provides hands-on practice with ear training and theory tools to test and reinforce your understanding.