1. Log in to the WordPress dashboard.
2. Then, on the Dashboard menu, go to Posts and click on Categories.
3. Enter the following details in Add New Category:
Name: Input the category name, for instance, "Computer."
Slug: Fill in a slug name or leave it blank.
Parent: Keep this as "None." If you select a category, it will become a sub-category of your chosen category.
Description: Input the category description, or you can leave it blank.
4. Lastly, click on Add New Category.