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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.
Instead of looking for quick answers on google, you can also try researching the documentation for your language. You'll learn a ton!
That depends on what you Google. Are you just throwing in an answer and leaving it or are you then exploring other avenues.
I had a brain fart and and to Google how to check for an empty array in JavaScript :)