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The Gm chord is the notes G, Bb and D. The usual shape is a barre at the 3rd fret: 3 5 5 3 3 3, from the low E string to the high E. The guitar above is set up with Gm on the A key: tap it or press A to hear it, then strum the strings.
Numbers are fingers: 1 index to 4 little
The top four strings, no full barre
Strum only the four thinnest strings: x x 5 3 3 3. It's a good way in before the full shape. Switch the guitar's chord level from Standard to Easy to hear it.
The same chord, higher and brighter
Play it as x 10 12 12 11 10, a barre at the 10th fret. Switch the guitar's chord level from Standard to Up to hear it.
These share a key with Gm, so they sound right together, and they're on the pads next to it:
All the chords: guitar chord chart. Songs to practice them: easy guitar songs. Tune up first with the online guitar tuner.