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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.
... but such feature is already there? There is "overall" ranking, and it is also broken down into individual languages. You can track it on your profile page, next to that round progress thingy, where all languages you trained are specified with progress you made in each of them.