general categories
There are 2 most general categories. These are metals and non-metals.
"Complex" and "Simple".
liquid, solid, gas
gaseous and sedimentary
implied and expressed
implied and expressed
general, mutual, direct, and close
general truth
democratic and authoritarian
Usually books are separated into these basic categories: Fiction, Non-Fiction, and Reference Although depending on your library, there can be more specific categories or more categories in general.
The four categories of support are general, mutual, direct, and close.