See every note on the guitar or bass neck, then drill them with a scored quiz — note names, and the interval, scale and chord shapes they build. Standard tuning, your choice of sharps or flats, 4 to 6 strings.
Most guitarists play for years without knowing the note under every finger. It is worth fixing — it turns chord charts, scales and theory from shapes you memorise into a map you can read.
Learn one string at a time, low to high. Start with the natural notes only — switch on "Naturals only" above. Say each note out loud as you play it. Once the low E and A strings are automatic, the octave shape (two strings up, two frets across on the D–G–B set; three frets across from the G string) gives you the rest for free.
Switch to "Find the note" — you are given a note name, you click every place it appears in the first twelve frets. Or "Name the note" — a fret lights up, you pick the name. Keep the streak going. Five minutes a day beats an hour once a week.
The last three modes light a shape on the neck and ask what it is. In "Name the interval" two dots appear and you give the distance between them; in "Name the scale" and "Name the chord" a whole box lights up with the root shown in white. This is how guitarists actually use theory — a minor pentatonic box and a dominant 7th grip are shapes first and formulas second, and being able to name one on sight is what lets you move it to any key.
The theory behind the layout — why the strings are tuned in fourths with a third in the middle, how that shapes chord fingerings — is covered in the Cloud Atelier guides. To see the notes of any scale before you find them on the neck, use the Scale & Chord Finder. Curious what guitars the players you follow reach for? Search the gear database.