Loading collection data...
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.
Looks like it isn't... I don't remember all possibilities, I log objects and look up whenever I need it. The safest way probably would be running user's code in a sandbox, but I'm not even sure how safe it would be.