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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
The description of the kata is correct. There are no cases in the tests where three posts of the same category are included. In such a case post id is used as a tiebreaker. That being said categories can have only one or no posts at all. When there are no posts you still need to return a row with category_id and category values.