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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.
Probably for fun/practice creating a class.
Sometimes the best way to learn how to do something is to apply it to an easy problem.. that way it is easier to see where it is going wrong.