Every fingering that fits a hand
x445
moderate · barre · no 5
9bab
hard
98ax
easy · no 5
98a7
hard · no 5
98ab
hard · no 5
What is true of it
E7 is E, G♯, B and D — 1, 3, 5 and b7 counted from E.
On an instrument that cannot reach all 4, the 5 goes first, in that order.
The easiest of the 5 fingerings below is x445: 2 fingers, one of them barring the 4th fret, held at the 4th 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 of the 5 need a barre.
It leaves out the 5. 4 strings cannot carry 4 notes, and the 5 is the one this chord can lose without changing what it is.
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
E7/G♯
1202
E7/B
4445
E7/D
7877
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.