Index finger (1): press flat across the A string to the G string at the 1th fret, a barre.
Middle finger (2): 4th fret of the low E string.
Ring finger (3): 4th fret of the high E string.
Let ring open: B string.
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Strumming patterns to try
↓↓↓↓Four downsSteady, for learning changes
↓↓↑↑↓↑Folk / popThe everyday pattern
↓↓↑↓↑BalladSlow songs, 3/4 or 6/8
↑↑↑↑Reggae skankOff-beat chops
About the A♭m(add9) chord
A flat minor added ninth is built from 4 notes: A♭ (1), C♭ (♭3), E♭ (5), B♭ (9). The lowest note you play should be the root, A♭, highlighted on the diagram. You can play it in 12 places on the fretboard. The first shape is the most common; higher shapes make smooth changes easier in some keys.