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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.
Because they want you to save that method on the "String" object. It's just another way to do things
It is definitely Ok and you are strongly encouraged to do so , just don't google the answer directly by typing the kata title or description ^^