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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.
In this case the point of the excercise is to help you learn how to format String data types in code, not to persuade you that american phone numbers are better. If you were developing software for a company someday in the future, you would need to be able to offer multiple formats for a phone number based off of the formatting style that the user prefers.