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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.
You're right, my bad.
I don't think you could be more explicit. Why do you think there's a company_id field in the products table if it's not for using it as a foreign key?
Should explicitly say that companies id is company_id.