Navigate to Admin > Blog > Categories to manage categories.
- Click Add a category to create a new one. Provide a name (required), slug (auto-generated if blank), and optional description.
- Each post can be assigned to one category.
- The post count for each category is shown in the category list.
- Deleting a category removes the category assignment from any posts that used it (posts themselves are not deleted).
Categories are global across all sites in your Omeka S installation.