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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 have absolutely no idea either and looking at the solutions didn't help either :(
It's possible things have changed, but when I made this answer, the wire key was always boom9.
Edit: Yep, things have changed. I'm surprised it wasn't labeled obsolete...
For me it's all about fun and learning new things. Sometimes reading other solution is more fun than kata itself ☺