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Well, I replied, but it disappeared on me. @ernie-boy, The shapes refer to the open chords and the shape they make on the fretboard. The 5 main open chords are C, A, G, E, D (hence the name CAGED). Those same open chord shapes can be played throughout the fretboard, but they would have different chord names based on where they’re played on the fretboard. However, the basic open chord shape is used (usually as a barre chord). So even though the name of the chord changes depending on where on the fretboard you are, you are still using the open chord “shape.” Hope this helps.
The 5 main open chord shapes (not letting me paste shapes) Try going to https://appliedguitartheory.com/lessons/caged-guitar-theory-system/