A♭ major has 4 flats (B♭ E♭ A♭ D♭). Its seven chords are A♭, B♭m, Cm, D♭, E♭, Fm, G°. Its relative minor is F minor, which uses the same chords with Fm as home.
On the wheel, IV, I and V sit side by side on the outer ring with ii, vi and iii right below them. Tap any key on the wheel to go to its page.
The same slot on the wheel with a different flavour. Sus chords swap the 3rd for the 2nd or 4th and like to resolve back to the plain chord (A♭sus4 → A♭). add9 adds the 2nd on top of the full chord. These are the common ones whose notes all stay in the key (here: A♭sus2, A♭sus4, A♭add9); the small label is the slot they sit in.
A♭ major: A♭ B♭ C D♭ E♭ F G. The key's seven chords are built from these notes; the borrowed and secondary chords above bring in notes from outside it.