Find below-mentioned points to Delete Category.
Step (1) − Navigate to Posts > Categories section from your wp-admin panel.
Step (2) − It will redirect you to Categories page. All of your categories are listed there. You can view the Category example (created in the previous chapter WordPress – Add Category. Hover on the Category and Click on Delete option.
Step (3) – A popup opens asking you to permanently delete the item. Just Click on OK button to delete the Category.