Note Layout on the Fretboard

 This diagram shows the position of each note on the fretboard, with the number at the top signifying the fret (zero meaning open) and the letter in the first column signifying the open string. Since chords are named after the bass note that they are formed around, this diagram will help you remember where chords can be formed on the fretboard. This is especially useful in dealing with bar chord locations, as they are the same chord shape moved up and down the fretboard.