Categories provide a helpful way to group related blog posts together, and to quickly tell readers what a post is about. Categories also make it easier for people to find your content. Categories are similar to, but broader than, tags.
Categories can be displayed at the top or bottom of posts, on the individual post view, and/or in the sidebar (using a sidebar widget). You can assign multiple categories per post (you must assign at least one).
The Difference between Categories and Tags
This example post demonstrates the difference between categories and tags:
Adding Categories within a Post
You can assign and/or add new categories to posts before you publish them using the Categories area to the right of the post editor:
Select the checkbox next to a category name to associate it with a post.
If you would like to add a new category to your blog and associate it with the post, click + Add New Category.
Click the Most Used tab at the top of the module to select from your already created categories that you use the most.
Use the Parent Category drop down menu to nest a category within a category.
Adding Categories via Your Dashboard
You can also add new categories and manage existing categories from Posts -> Categories in your dashboard.
You will be presented with a list of your existing categories and an option to add new categories.
You can add a new category by filling out the fields:
Name – As expected, the name of your category.
Slug – Will be automatically generated based on the name.
Parent – If you want to nest a category within a category, select the parent category. Otherwise leave at none.
Description – Describe what the category is for. This description will appear as a tooltip if you use the category widget. (Optional)
Click Add New Category to add the new details to the list.
The Posts -> Categories page in your dashboard displays all your categories and shows the name, description, and number of posts belonging to each category. If you move your mouse over a category a set of options will appear, allowing you to edit, quick-edit, or delete that category:
If you click on Quick Edit the category will change into an edit box and you can rename the category quickly:
If you click on Edit you will taken to a separate page where you can edit the name, parent, and description. This functions exactly the same as adding a category.
Clicking on Delete will delete that category.
Setting the Default Category
A default category (“uncategorized”) will be assigned to published posts if you don’t specify one. The name of the default category can be changed under Settings > Writing in your dashboard.
Deleting a Category
When a category is deleted, all posts that were only in that category will be assigned to the default category. If a post was also in other categories it will remain untouched. Note that you cannot delete the default category.
Converting Categories to Tags
If you change your mind about using categories and instead want to convert them to tags, you can do so using the category to tag converter. At the bottom of the manage categories screen is a link to the category to tag converter.
Clicking this will take you to a screen where you can select which categories to convert to tags. Make your selection, click on convert categories to tags. Your categories will be removed and tags will be assigned to the posts that used to be in those categories.