Pronouns are things that replace that noun with her or him, but this is accommodated by the sentence subject.

what i meant is in a sentence when there is an object or person in the sentence is when you are allowed to use a pronoun

Personal Pronoun:-

Now pronoun that changes by the way of sentence example:-

I love cars

we love studying

they can do anything

I, we, they are personal by your sentence

now she is a third perspective while i is a first point of view