If I'm reading your question right, I think the answer is "Fiction" and "Non-fiction".
You haven't stated any categories.
You tell me!
The two main categories are convenience goods and shopping goods; two lesser categories are specialty items and unsought goods.
Deoxyribose and Ribose
descriptive and inferential
botany and zoology.
IT is separated into two main categories (1) those which process information, such as computer systems, and (2) those which disseminate information, such as telecommunication systems.
There are far more than two genres, or categories, of literature. Perhaps you are thinking of the two major classifications of literature, fiction and non-fiction.
linear and non-linear resistor
animal and vegetable
The two main categories of luster are metallic and non-metallic. Metallic luster appears shiny and reflective like metal, while non-metallic luster includes categories such as vitreous (glassy), pearly, greasy, and dull.
It is not possible to answer as there are many more than 2 categories.