Every fingering that fits a hand
2402
easy
2452
moderate · barre
x977
easy
What is true of it
Asus2 is A, B and E — 1, 2 and 5 counted from A.
These are also the notes of Esus4/A. Which name is right depends on what is underneath and what came before — the notes alone do not decide.
The easiest of the 3 fingerings below is 2402: 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 of the 3 need a barre.
Where its notes are on the neck
The brass dots are A, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
Asus2/B
4400
Asus2/E
x470
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.