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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.
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watch web dev simplified tutorial it helped me understand regex a lot
I'm not sure I'd put much sway by the "best practice" votes. I see plenty of examples of things marked as "best practice" that I'd mark as a major fail in a code review