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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.
Well, you could do even something better: suggest improvements!
I don't think user blocking feature works that way, no, it doesn't. You'll have to look at the author's name and decide for yourself.