Human: I need some information on the different types of hats. Assistant: 
Hats come in many shapes and sizes, but there are basically three main categories: fedoras, caps, and beanies. Fedoras are a type of wide-brimmed hat with a curved top and usually a flat brim. Caps are close-fitting or fitted headgear that covers most of the forehead and part of the back of the head. Beanies are typically made from wool, cotton, or synthetic materials and cover the entire head.