Categories play an important role in organizing your content hierarchy. Articles can belong to multiple categories.
Managing Categories for an Article
Find the article you want to manage in the control panel.
Locate and open the Categories tab.
Select the checkboxes next to the categories you want the article to belong to. Changes are updated immediately.
The article will now appear under the selected categories.
Note:
If you do not select any categories or remove all categories, the article will not be accessible through a Guide, collection, or category navigation.
However, the article can still be embedded directly into your site.