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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.
Wow, this took some time. If you are having trouble understanding how it works, doing it manually on a piece of paper might help.
A little tip from me - if you are doing this on JavaScript make sure when you are checking/incrementing/decrementing the cells they aren't undefined. That stupid mistake took me a lot of time to notice.