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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.
Agreed. If article explained would make actual sense what the to-do is.
Have you considered that maybe this kata is not an introduction to vectors, but an exercise on vectors ( with some light programming thrown in ) ? And in that light, the description is not bad.
There are other kata that might introduce you to vectors, after which you may find this one less daunting.
But please don't blame this kata for not being something it is not.