Banjo Em7 chord (Open D)E minor seventh on the 5-string banjo: 2 1 2 0, and 5 more shapes

Frets, string 4 to string 1: 2 1 2 0 (open position)

1. String 4 (D): 2nd fret, middle finger, E
2. String 3 (F♯): 1st fret, index finger, G
3. String 2 (A): 2nd fret, ring finger, B
4. String 1 (D): open, D
5. String 5, the short f♯: open, F♯, not in the chord

Sounds: E G B D  ·  Em7 is E, G, B, D (1 · ♭3 · 5 · ♭7)

The 5th string: the short f♯ rubs against the G in this shape, a semitone away: some players let it ring, some skip it.

Open D tuning: f♯DF♯AD, the short 5th string first, then strings 4 to 1.