It builds a body of understanding, and, if done well, helps build a workplace culture. It can be easier than you think. They pay attention to their work and to them as human beings. They never make assumptions about the motives that drive the student's words or actions. They take time to learn the person's hopes, fears, and history.
Coaches check their egos at the door.
They resist trying to impress a student with their knowledge. When coaching is done well, learners believe they personally have discovered ideas and answers, hence, they may never acknowledge the coach's contribution. And that should be just fine with the coach. Coaches ask questions. Coaches listen completely.