According to aristotle, what is the function of man?

He says that to discover the human goods, we first gotta identify the function of a human being in which he says that is rational activity

according to Aristotle, the concept of virtue is based on a very special conception of man as a rational being. Virtue, accordingly, is rational activity, activity in accordance with a rational principle.

In everyday's life, Aristotle believe that men has to keep doing good deeds based on this virtue that we have