Every fingering that fits a hand
020002
open
054000
easy
050002
easy
020032
open
024030
easy
What is true of it
Em9 is E, G, B, D and F♯ — 1, b3, 5, b7 and 9 counted from E.
On an instrument that cannot reach all 5, the 5 and 1 go first, in that order.
The easiest of the 5 fingerings below is 020002: 2 fingers, held at the 2nd 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 E, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
Em9/G
320002
Em9/B
x20002
Em9/D
xx0002
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.