So which note you fret depends on the inversion of the chord I am playing? Or is it depentant on the lowest root note?

I can understand the theory in terms of playing a piano, for instance, but can't quite work out what this means in terms of playing guitar. Since most of the time, a guitarist will just fret whichever notes are easiest to obtain the required combination of letter name notes.

Do you understand what I am saying? So on a piano, a Cadd2 and a C9 chord are played differently, but as both essentially mean - add a 'D' to a guitarist, they are the same chord.
Yes/No?

JE