Octaves are two pitches of the same note. The are just double the frequency.
For example standard A = 440htz. A one octive up = 880htz. Though one is higher than the other they are both A. Remember, although there are many spots on
the fretboard, there is only 12 notes. The example below shows the pattern
of octives in A. This can be applied to all other
spots on the fretboard. The red lines I put in the diagram to easier visualize
the pattern. For example 2 strings down, 2 frets across, if your root is on
the E or A string. 2 down 3 frets across for all other strings. |