In Wordpress Categories allows to divide content into different section.
Click on post ->CategoriesThen you will find a page like this
Here to add categories there are four main field
Here you have to put your category name.
In Add category the slug is used in the URL to display your category.
Example : Suppose your category name is “Office table” then the slug should be office-table.
Parent category is mainly used if you want to set a category as a subcategory of another category.
It is the brief description about the category.
After fill all the data click on the Add New Category Button