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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.
No problem, read TheOriginalTripleD's post there btw, he explained it in detail.
Why don't you ask in the solution instead of posting a solution in Discourse? That way, the people who submited that solution will be notified and it's more likely they answer you how it works. I bet there is already an explanation there.
Yeah....I don't know either now....
It is completely of no use, feel free to skip it.