If you don't understand the fretboard, you will have to live with:
Figuring out the fretboard, step by step...
If you are to succeed at this, you will need to "disentangle" the guitar fretboard, step by step.
The first point is that the guitar, like the piano, is based on the standard 12 tone equal-tempered system. This means that we have only 12 tones to choose from. These tones may repeat an octave higher or lower, giving us a different note, but those 12 tones are all we have. The only exception is when we bend a string, or use a tremolo bar.
On a guitar, if you play two adjacent frets on the same string, you'll hear the interval of a semitone(or minor second). If you skip one fret, the interval is a whole tone (major second).
Once we know this, we can start exploring our first view of the fretboard —along the each string:
Then, we can start looking at scales and modes, and eventually melody:
After we have understood the way the fretboard works along the strings, we need to connect them up by looking across the fretboard, at the relationship between the strings:
Connecting this view -across the fretboard- with the way each string is divided into 12 tones -along the fretboard- gives us a full view —the complete guitar fretboard chart!