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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.
No, please read the posts below, it's been asked and answered many times.
No number will begin with a 0 unless the number itself is 0, therefore 00 would not be a valid number.
That's the point.
It's testing to see if your code can determine whether you're ending up at your original spot. If your code can't determine that, it's incorrect code.