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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.
It's been a minute, but if you're still interested, try looking up "method groups".
They are essentially a way of telling the compiler: 'Hey, here's the name of a method with multiple overloads, please find the one with the correct signature for this scenario'.
At least that is my probably flawed understanding.