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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.
I found the instructions unclear. I think the description should be re-written to be more clear about using the age_sum alias.
I second this. I think it would be great to be able to show your rank on your LinkedIn profile.
I think it could be done somewhat easily as well. DataQuest.io already offers LinkedIn certs for completing some of their lessons.