Banjo Fm chord (C Tuning)F minor on the 5-string banjo: 0 1 1 3, and 3 more shapes

Frets, string 4 to string 1: 0 1 1 3 (open position)

1. String 4 (C): open, C
2. String 3 (G): 1st fret, index finger (barre), A♭
3. String 2 (B): 1st fret, index finger (barre), C
4. String 1 (D): 3rd fret, ring finger, F
5. String 5, the short g: open, G, not in the chord

Sounds: C A♭ C F  ·  Fm is F, A♭, C (1 · ♭3 · 5)

Found in: C minor (iv), E♭ major (ii), D♭ major (iii), A♭ major (vi), B♭ mixolydian (v), E♭ mixolydian (ii)

The 5th string: the short g rubs against the A♭ in this shape, a semitone away: some players let it ring, some skip it.

C Tuning tuning: gCGBD, the short 5th string first, then strings 4 to 1.