guitar chord
A♭7
Major triad, minor seventh. The chord that wants to resolve a fourth up.
Written the other way round it is G♯7 — the same twelve keys on a piano, a different piece of notation.
Every fingering that fits a hand
464544
moderate · barre
46454x
moderate · barre
464574
hard · barre
4645xx
moderate · barre
xx6878
hard
What is true of it
A♭7 is A♭, C, E♭ and G♭ — 1, 3, 5 and b7 counted from A♭.
On an instrument that cannot reach all 4, the 5 goes first, in that order.
The easiest of the 5 fingerings below is 464544: 3 fingers, one of them barring the 4th fret, held at the 4th fret.
None of them uses an open string, so this chord moves up the neck unchanged — the same shape 1 fret higher is the chord a semitone above.
4 of the 5 need a barre.
Where its notes are on the neck
The brass dots are A♭, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
A♭7/C
89a898
A♭7/E♭
xx1112
A♭7/G♭
xx4544
An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.