Tuning: D A D F# A D (low → high). Barre shapes give majors at any fret. For minor, lower the 3rd string by one fret relative to the barre.
root
3rd
5th
open string
Choose a key/scale and filter qualities.
Notation: Numbers show fret at each string from low (6) to high (1). Example Bm: 9‑9‑9‑8‑9‑9 (3rd string one fret lower).