Every fingering that fits a hand
x432
easy
9777
hard
977x
easy
977a
hard
9bca
hard
What is true of it
Em is E, G and B — 1, b3 and 5 counted from E.
On an instrument that cannot reach all 3, the 5 goes first, in that order.
The easiest of the 5 fingerings below is x432: 3 fingers, 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.
1 string stays silent.
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
Em/G
0402
Em/B
4707
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.