Guitar theory is just the stuff that explains why what you play works. You only need a handful of core ideas and the fretboard starts making a whole lot more sense. No jargon here — just plain-language theory that helps you play better.
Start Here
What Theory Do I Actually Need?Which concepts are worth your time and which ones you can safely ignore.The Major Scale — The One Scale That Explains EverythingChords, keys, harmony — it all traces back to this one pattern.
Keys, Chords & Progressions
How keys and chords relate to each other — once this clicks, you stop guessing and start knowing what fits.
What Chords Go Together?
The simple rule behind chord families — works in any key, every time.
What Key Am I In?
Three methods to figure out the key of any song using your ears.
What Is a Chord Progression?
The 10 most common progressions — with examples and the theory behind them.
The Number System Explained
How guitarists talk about chords — I-IV-V is simpler than it looks.
Major vs Minor Keys
What’s actually different? It comes down to one note.
Scales & the Fretboard
Scales aren’t just finger exercises — they’re the source code for chords, melodies, and improvisation.
The Pentatonic Scale Explained
Five notes, one pattern — why it’s the first scale every guitarist learns.
Learn the Notes on the Fretboard
Start with two strings and a few patterns — that covers most of what you need.
How Chords Are Built
Major, minor, and 7th chords — the formula behind every shape you play.
FAQ
Nope — but even a little makes everything easier. You’ll learn songs faster and stop relying on pure memorization.
Same principles — keys, scales, chords, intervals — just focused on how they show up on six strings instead of a piano.
Start with what chords go together. Then the major scale. Those two alone get you surprisingly far.
The core concepts click in a few focused hours. Applying them smoothly takes longer, but you’ll see results almost immediately.
Not for any of this. Everything here uses chord names, tab, and fretboard diagrams.