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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.
Seems precise enough to me. It needs some knowledge. If one does not have this, a more precise description wont help (In my opinion, the last information is already too much).