Tones and semitones on your guitar fret board.
The names of the notes used in music are given below, the notes in brackets are notes which can have two different names but they are the same not. For example A sharp (A#) and B flat (Bb) are the same note.
A (A# or Bb) B C (C# or Db) D (D# or Eb) E F (F# or Gb) G (G# or Ab)
An interval of a semitone is achieved on your guitar by either moving up one fret from your current position or down one fret. For example moving from A to A# is semitone.
An interval of a tone is achieved on your guitar by either moving up two frets from your current position or down two frets. For example moving from A to B is tone.