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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.
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This needs more sample test cases.. Yes I get its a fairly simple question, but even two more test cases could build confidence
The description states "Please keep in mind that the test cases ensure that the number of people in the bus is always >= 0. So the return integer can't be negative." however there doesn't appear to be a specicic test case that checks for this. To me this states that the developer needs to check that their return can't be negative, not that the developer doesn't need worry about negative numbers, because you can't have negative people.
I would either clarify, or add a test to ensure that data anomolies are properly handeled by the developer.