Every fingering that fits a hand
023x
open
0235
easy
x7aa
easy
What is true of it
G5 is G and D — 1 and 5 counted from G.
The easiest of the 3 fingerings below is 023x: 2 fingers, held at the 2nd fret.
1 of them use open strings, which is what makes a shape quiet to change to.
1 string stays silent.
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
G5/D
x235
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.