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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.
Linq has been a part of C# since version 3. It is not a separate library. Using linq means you are writing functional code. If you are a beginner, you should try writing loops to understand programming but I would never use a loop to find an item in a collection in production code.