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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.
Honestly the fastest way to learn these lambda expressions is just to do katas the way you know how to do and then compare your solution. When I learned C# that's just what I did. :)
Do not think "I would have never come up with this simple solution", but rather "Oh so that's also a way to do it".
Keep on keeping on!
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