Gestión and dirección are often interchangeable, but not always. "Dirección" has more to do with leadership and being the one who makes the decisions, while "gestión" has more to do with administrating, handling or dealing with things. The associated verbs are "dirigir" and "gestionar". Since "management" usually involves both things, both words are often interchangeable, but you don't have to be the leader to manage something.