Every fingering that fits a hand
x543
easy
a888
hard
a88x
easy
a88b
hard
What is true of it
Fm is F, A♭ and C — 1, b3 and 5 counted from F.
On an instrument that cannot reach all 3, the 5 goes first, in that order.
The easiest of the 4 fingerings below is x543: 3 fingers, held at the 3rd 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 F, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
Fm/A♭
101x
Fm/C
554x
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.