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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.
You are allowed to use all the tools your language of choice provides to you (as long as you are not manipulating the test framework). If you want to use them or rather want to write everything yourself depends on your personal preference and training goals.