We use “to me,” as in “She gave the apple to me,” to indicate movement or action toward yourself; “for me,” as in “She reserved the apple for me,” to indicate that the object or recipient of an action is yourself. The important thing to remember is that in general, “to” is a preposition for indicating movement toward a place, person, or thing, while “for” is a preposition for indicating the object or recipient of a perception, desire, or activity as well as for indicating purpose or intended goal.