Stressed pronouns are always used after a preposition; they can also be placed after a verb for greater emphasis, hence the name “stressed.” For example,
Questi fiori sono per te. = These flowers are for you.
Come state voi?! = How are you guys doing?!
A me non piace questo posto. = I don’t like this place.
Andiamo da lei. = Let’s go to her place.
Vengono con me. = They are coming with me.
Notice that the set of stressed personal pronouns is very similar to the set of personal pronouns:
Piacere, interessare, mancare and other verbs that require an indirect construction will sometimes use the standard indirect-object pronoun, or they will sometimes use a stressed pronoun. For example, mi (“to/for me”) can be spelled out in this stressed form in Italian as a me. E.g.,
Mi piace cucinare. OR A me piace cucinare.
I like to cook.
Gli interessa la fisica. OR A lui interessa la fisica.
He is interested in physics.
Le piacciono le patate fritte. OR A lei piacciono le patate fritte.
She likes french fries.
Mi manca molto. OR A me manca molto.
I miss her/him/it.