Categories provide a helpful way to group related 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. For more information on the differences between categories and tags please check out this support doc.
Depending on the theme and widgets you have activated, categories can be displayed at the top or bottom of posts, on the individual post view, on your menu, and/or in the sidebar. You can assign multiple categories per post (you must assign at least one), and categories can be organized hierarchically.
Adding Categories via the Categories Module
You can assign and/or add new categories to posts before you publish them using the Categories module to the left of the post editor:
When you click on the Categories & Tags option, it will expand. You can either use a current category or add a new one.
- If you select Add A New Category, a window will appear with a field to type in the new category name. Once you enter the category name, select Top level category and click Add. Both the default category and the new category will be selected, and you can de-select either one before publishing the post.
- Categories will appear in alphabetical order. If you have more categories than what appears in your post editor, you can begin typing a specific category name into the search field, and corresponding categories will appear.
- To add a sub-category, click Add A New Category and type the sub category into the field. You have the option to select Top Level Category, or you can select one of the categories already present on your site. Select the category you want to become the parent of the new sub-category, and click Add.
Setting the Default Category
A default category (uncategorized) will be assigned to published posts if you don’t specify one. The default category can be changed under Settings -> Writing in your dashboard.
Your posts will appear in the topics listings of any tags or categories you use. Therefore, assigning tags and categories to your post increases the chance that other WordPress.com users will see your content.
However, you don’t want irrelevant content showing up on the topics listings or search, and neither do we. That’s why we limit the number of tags and categories that can be used on a public topic listing. Five to 15 tags (or categories, or a combination of the two) is a good number to add to each of your posts. The more categories you use, the less likely it is that your post will be selected for inclusion in the topics listings. Learn more about Topics here.