Picture book authors, teachers, and poets, don’t miss this fabulous collection of collective nouns. Never heard of them? Take a look. You will be enchanted.
If you write fantasy or books for children, here’s a treasure trove of information. It lists the categories of folktales. You can plug the descriptions into Google and find examples in a wink.
What do you think about a new category of books–“New Adult”? It would be for ages 14-35. Here’s an article about the idea and reactions to it.