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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.
While it is certainly correct, this is not Kotlin-like at all. You are not leveraging the Kotlin language, but present a mere "Javaesk" solution. So, it's not a best practice I would argue.