The fretboard
Standard tuning, low to high: E2 · A2 · D3 · G3 · B3 · E4. Every fret raises the pitch one semitone. Twelve frets make an octave. The thin high E string is at the top of the screen.
Reading guitar notation
Guitar uses treble clef and sounds one octave below the written notes. A written E3 sounds as the low open E2 string. Text labels and fretboard answers use sounding pitch.
Chords and shells
In arpeggio drills, play the requested notes one at a time. Shell practice uses at most one note on each string; choosing a new fret replaces the old one. In shell-voicing exercises, the amber root is supplied. Add the third and seventh on the available strings to make a nearby, playable grip. Sixth chords use the sixth instead of the seventh.
Hear the changes
A major ii–V–I moves from minor seventh to dominant seventh to major seventh. In C: Dm7 → G7 → Cmaj7. Their thirds and sevenths carry the harmony. Keep common tones and listen for half-step movement.
Keyboard shortcuts
Arrow keys move around the fretboard. Space selects a fret. Enter checks or continues. 1–4 choose an answer. H gives a hint; P plays the question.