Like tags, categories provide an easy way to group related posts together and to quickly tell readers what a post is about. Categories are much broader than tags.
Adding a category to a blog post
You can add a category to a post by ticking it or add a new category by clicking Add New Category.
Creating a new category
In order to add/delete a category go to Posts > Categories.
To add a category, simply type its name in the Category Name field. If you wish, you can also type a category slug, description and choose a parent item. Then click Add Category and your new category will be created.
To delete an existing category, hover over it and then click the Delete button.
You can’t delete the default Uncategorized category.
If you delete a category that has posts filed in it those posts will be assigned to the Uncategorized category.
Adding a category to a post
Once you have added a new category you can then file new posts in that category. To add a post to a category while you are writing or editing a blog post tick the desired category(s) from the category meta box on the right hand side of the page.