Excellent advice on the ‘Classical’ and ‘Rock’ position grip.
You also (in the rock mode) use the thumb as a fretting digit.
And from my limited ‘Classical’ school time knowledge, the right hand (string plucking hand unless you are 1bassleft) the little finger is not used?
might be my old guitar teacher telling me porkies.. or pinkies in this case, but thats what i was told. 😆