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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'm still learning Python, and haven't covered defining functions yet, but I was able to pick up on this one because of exercises I've completed in the Udemy course I'm taking. I thought this was very straight forward.