Try learning 4 string sets in chords and 5 or 6 fret areas in scales. C,A,G,E,D system will connect chords/scales in a big pattern. Use a fretboard diagram to draw out the scales, highlight the chord tones as in the above system. You'll see the connection points.I.E.draw out a C scale and highlite the C chord tones in it, then do the same for an A scale PATTERN starting from the 3rd fret (which is a C scale),highlighting all c-e&g notes. Now G then E then D,get it? Remember: classical scales are tight, under the fingers and make outside notes hard to reach, while jazz/rock scale fingerings are open wide and put outside notes under the fingers.