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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.
True, and pretty sure this is what the question asks for (although I agree it is badly defined).
There is:
From the documentation:
https://www.postgresql.org/docs/9.6/arrays.html
There's a rank breakdown in your profile, even without CW Red.
Only with CodeWars Red subscription, AFAIK. (you can check my profile what it looks like)
There is a version selection box on the upper right corner of the 'Your Code' text box. For many kata, Python3 is still not supported.