I’ve always thought of it this way: first, one has to settle on a tuning, for example GCEA. Then one considers the Nut to be the same as one’s finger(s). That means, for example, that the open strings playing a C6 (or Am7 depending on context) is the “Shape” of a Full Barre chord as one goes up the fretboard; C#6, D6, D#6, etc. Likewise, a Nut plus one finger Chord, such as Am, A7, or C7 takes the Chord Shape name of that chord, as it is moved up the fretboard with the aid of a Barre above, becoming successively higher chords. And from there, always starting at the Nut, one identifies two, or three, finger chords, and gives each the “Shape” name of that chord closest to the Nut. Note, the Nut alway plays a role defining one or more notes. In such manner, every Chord Shape, i.e. every Chord, can be identified. For example, the four finger F#7 is seen as an E7 shape, where the Nut accounts for E in the chord. Once the “Shape” of each chord is understood, it is only a matter of moving that shape up the fretboard to play successively higher chords.
"The sole cause of all human misery is the inability of people
to sit quietly in their rooms." - Blaise Pascal, 1670
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