Every fingering that fits a hand
0231
open
x765
easy
caaa
hard
caax
easy
What is true of it
Gm is G, B♭ and D — 1, b3 and 5 counted from G.
On an instrument that cannot reach all 3, the 5 goes first, in that order.
The easiest of the 4 fingerings below is 0231: 3 fingers, held at the 1st fret.
1 of them use open strings, which is what makes a shape quiet to change to.
Where its notes are on the neck
The brass dots are G, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
Gm/B♭
323x
Gm/D
x231
An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.