What do teachers mean when they say about a book It's the narrator's own experiences?

Answer 1

The term for relating one's own experiences is autobiographical (about himself).

The viewpoint of a narrator who is relating his own experiences (e.g. I went down to the village) is called first-person narration. If it is from the point of view of an observer (e.g. The men went down to the village), it is third-person narration.

Answer 2

When teachers say a book is the narrator's own experiences, they are likely referring to a first-person narrative where the narrator is telling the story based on their own personal experiences. This can create a sense of intimacy and authenticity in the storytelling, as the narrator is directly involved in the events they are recounting.