If you can play a regular F chord you already have it whipped!
l at the first (fret) (pointer finger
2 at the first(fret) (pointer covers both strings here on the first fret
3 at the second(fret) middle finger
4 at the third(fret) ring finger
5 at the third(fret) pinky finger
6 not played or muted ....*
*(if you have a hard time with the barre shape) otherwise it would be played on the first fret)
F# is the next chord on the guitar neck in the same position
1 at the second(fret)
2 at the second(fret)
3 at the third (fret)
4 at the fourth
5 at the fourth
6 not played or muted
G would be the next on the neck , slide 'em all up one etc...
If you only need to approximate the sound a rocker technique is to play only a root and a fifth of the chord
you could play
6th string second fret
5th string fourth fret
and for good measure the octave of the F# played on
4th string fourth fret.
These are all moveable or mobile chord shapes the only thing that changes is the fret postition and the name of the chord!
The root/fifth /octave shape derives the chord name or (tonic)
from the note on the sixth string.
1st position is F
2nd pos. is F#
3rd position is G ....etc
Hope you are not confused. I'm trying to explain this in the simplest terms and hope it is useful for you!
I remember learning F chord it was a good while till I got it sounding well!