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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.
Btw, avoid using global vars is mentioned in the Troubleshooting guide: https://docs.codewars.com/training/troubleshooting#works-but-no
Suggestion tag is used to improve the kata (like clarifying something, adding test cases, announcing a translation), not to avoid a problem with your code.