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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.
Practice and also being able to review and understand other people's solutions. The less compact solutions aren't necessarily better or worse--they provide more detail into the underlying logical structure of the solution, whereas the more compact solutions take advantage of abstractions of the underlying logical structure of the solution--which may or may not perform better.
It was fun!
But it's kind of daunting to spend an hour and see that the answer in the solutions is so compact while yours is so long :p
How do you even come up with those super smart solutions ?