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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.
to return the list empty if there are no inputs
What if you don't?
I would advice you to solve a great number of very easy katas (8 kyu + 7 kyu). If you find one difficult, it's no use to spend a lot of time on it, you may come back to it once you are more comfortable with its requisite. By repeating the task of solving basic katas I bet you will really improve your skills and become more comfortable with many basic features. At least that worked for me. There may be other very good resources online, but I don't know them.
What language?