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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.
I agree, imo it would be much clearer if the first part with the comments was not included.
The "cannotUseFun" made me think I'm not supposed to use "fun" keyword, if it could be renamed to "cannotUseForbiddenKeywords" or something of that nature it would prevent misunderstandings.