One of the best phrases I have used in leadership is, “I don’t know.” Admitting you don’t know something actually invites new knowledge and collaboration. You may be able to fake your way through a conversation a time or two, but a sharp person quickly figures you out.
A confident leader is able to admit what they don’t know. This practice puts people at ease and gives more weight to what you actually do know. Plus, who really wants to be around a “know-it-all” anyway?