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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, and no, all the comments are visible from the home page Discourse (and from other places too) unless you actually mark them as having spoiler content, even the comments in the solutions.
Use spoiler flag next time, please.