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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 was about to post this purplemath link. Mathematically challenged, I found it more helpful than the link in the instructions.
Even if you don't understand your solution, writing something that works makes it more likely you will understand more advanced cases, because you have more opportunity to see patterns. I think every bit of practice helps.