Every fingering that fits a hand
x220
moderate · barre
7655
moderate
765x
easy
79a9
hard
x225
moderate · barre · no 5
What is true of it
D is D, F♯ and A — 1, 3 and 5 counted from D.
On an instrument that cannot reach all 3, the 5 goes first, in that order.
The easiest of the 5 fingerings below is x220: one finger, one of them barring the 2nd fret, held at the 2nd fret.
None of them uses an open string, so this chord moves up the neck unchanged — the same shape 1 fret higher is the chord a semitone above.
2 of the 5 need a barre.
1 string stays silent.
Where its notes are on the neck
The brass dots are D, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
D/F♯
x655
D/A
2220
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.