A F# Minor (F#m) chord contains the notes F#, C#, A. It is built from the minor formula 1 - ♭3 - 5, with F# as the root.
What shape is F# minor based on?
The open E minor shape. Slide E minor up two frets and lay the index finger flat across all six strings at the 2nd fret, and you have F# minor — which is why learning E minor cleanly pays off later.