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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.
Ah, gotcha. I swappped out the Hash class for a list and it worked. Not sure why the OP decided to break the hash class but it definitely caused me a lot of confusion and headaches because I did not see that comment. OP should make it very obvious before deciding to completely remove one of the most core data structures in computer science. Things would have been way more clear if OP broke the methods by having them raise NotImplementedError or something.
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