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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.
yeah how
OP solved it, closing
This comment is hidden because it contains spoiler information about the solution
I know this is old comment, but for anyone else wondering: https://docs.codewars.com/gamification/ranks/
Each rank is defined by having a certain score. Each kata is worth a constant score.
e.g. 8kyu always award 2
However, reaching 4kyu takes 643 score. So its impractical to level up on easier problems.