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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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I'm happy with either solution. In most cases, I'd probably just use the lambda rather than itemgetter unless I knew I'd be working with a large dataset, but either way works fine. itemgetter turns out to be a little bit less expensive, time wise, and you only have to pay the import cost once, so I decided to run with that instead of the lambda.