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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.
Agreed. The previous comment of "0 is not positive by definition" is wrong (and presumptuous, given the tone).
See: "https://math.stackexchange.com/questions/26705/is-zero-positive-or-negative" for a remark about this issue.
0 is not positive by definition, math 101.