So far, most of what we've learned on the guitar has been focused on the bottom few frets of the instrument. Most guitars have at least 19 frets - by only using the first three, we aren't using the instrument as effectively as we could. Learning the notes all over the guitar fretboard is the first step we need to take to unlock the instrument's full potential
The Musical Alphabet
Before we begin, it is very important to understand the way the "musical alphabet" works. It is similar in many respects to the traditional alphabet, in that it uses standard letters (remember your ABCs?). In the musical alphabet, however, the letters only progress up to G, after which they begin again at A. As you continue up the musical alphabet, the pitches of the notes get higher (when you go past G up to A again, the notes continue to get higher, they don't start at a low pitch again.)
Another complication of learning the musical alphabet on guitar is that there are extra frets in between some, but not all of these note names. The graphic above is an illustration of the musical alphabet. The ties between the notes B and C, and also between the notes E and F, reflect the fact there is NO "blank" fret between these two sets of notes. Between ALL OTHER notes, there is one fret space.
This rule applies to all instruments, including piano. If you are familiar with the piano keyboard, you will know that there is no black key between the notes B and C, and also E and F. But, between all other sets of notes, there is a black key.
SUMMARY: On the guitar, there are no frets between the notes B&C, and between E&F. Between all other notes, there is one (for now, unnamed) fret between each.