There's no single "Homer" who is universally recognized as having a teacher figure that's crucial to his goal achievement. The term "Homer" usually refers to the ancient Greek author of the *Iliad* and the *Odyssey*. We don't know anything about his life beyond the works themselves, and therefore have no knowledge of any specific teacher who influenced him.
If you're referring to a specific Homer from another context (e.g., a character in a book, TV show, or film), please specify. Then, it would be possible to discuss the role a teacher plays in *that* Homer's life and achievements.