guitar chord
Fadd9
F1A3C5G9
A major triad with a ninth added and no seventh — which is what tells it apart from a ninth chord.
Every fingering that fits a hand
103011
moderate
103013
moderate
10301x
open
1030xx
open · no 5
xx3213
hard
What is true of it
Fadd9 is F, A, C and G — 1, 3, 5 and 9 counted from F.
On an instrument that cannot reach all 4, the 5 goes first, in that order.
The easiest of the 5 fingerings below is 103011: 4 fingers, held at the 1st fret.
2 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 F, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
Fadd9/A
x03011
Fadd9/C
x35065
Fadd9/G
303011
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.