Yes, you can.
Categories are tied into Collections. Once you've got at least one Collection created and selected in the page publish popover, a + Add category link shows up.

How to add a category
After clicking the link, the category editor opens up. Add the category name (e.g., marketing), description, and category page URL.

Upload a social media share image and choose if the category page is available for Google and AI bots to index.
Then, attach the category to the post and publish.
The post will then show up in a category-specific page and in a URL like mydomain.com/blog/category-url
Managing categories
You can add multiple categories to each post.
After you've added at least one category page, you can find and manage all categories on the Pages tab.
