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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.
This is not an issue. Both zero-based and one-based numbering are "conventional" and in different contexts one-based may be preferred over zero-based.
Use conventional zero-based numbering.