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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.
Me neither, but it's actually mentioned in the description:
Although it's incosistent with the instruction:
Not a kata issue, it's like that in PHP 7.0
Description is already updated.
Wrong you can pass it with System.out.print and System.out.printf as long as you print a line as the description says and not just the phrase hello world ;)