The CAGED system organizes the guitar neck around the five open major chord shapes spelled by its name: C, A, G, E and D. Each of these shapes can be slid up the fretboard and, with a barre, turned into a movable chord, so the C shape played higher up becomes a D, an E, and so on. The five shapes interlock, meaning the top of one shape connects to the bottom of the next, and together they cover the entire neck without gaps. This gives players a framework for visualizing chords, arpeggios and scale patterns in five overlapping positions rather than memorizing isolated shapes. Understanding CAGED helps you find the same chord in multiple places, improvise across the whole neck, and see how scale tones relate to the chord underneath. It builds directly on knowing where notes fall on the fretboard, which is why note-recognition practice pairs naturally with it. FretMind's fretboard trainer strengthens exactly that underlying note knowledge.