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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.
No answer after 3 weeks, closing.
If you want responses or help, you need to give a bit more than that. What do you not understand? What did you try? What do you want told?
The kata description tells you what the goal is.