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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.
Good articles, thank you, one of them pointed me in the right direction. This one helped me along them as well: https://www.essentialsql.com/recursive-ctes-explained/
After dealing mostly with ORMs and programmatic solutions of complex DB queries, this kata seemed confusing, but once solved, it's quite fascinating.