Position of the notes on the fretboard

The graph below illustrates the position of the notes on the fretboard of the guitar. As you can see, the altered notes are identified as sharp (#) to facilitate the reading. Remember that an altered note can have two different names according to the graph below, seen in the section devoted to inharmonic notes.

Italian DO RE MI FA SOL LA SI
English C D E F G A B

Comparative table of inharmonic notes

C# = Db D# = Eb F# = Gb G# = Ab A# = Bb