If a boy flies or a dog goes to school, you're reading fiction. How else do you know? Quick, fun examples help you understand the make believe of fiction.
If a story has magical creatures or a fairy princess, you're reading folklore. How else do you know? Quick, fun examples help you understand the magic of fairy tales, fables, and folk tales.
If words describe a feeling or some words rhyme, you're reading a poem. How else do you know? Quick, fun examples help you understand the beauty of poetry.