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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.
mention the language please
You should say which language you're using. You probably misunderstand something and need to analyze it better. See if this can help: https://docs.codewars.com/training/troubleshooting. If you do think there's a problem or something impossible to understand, you may post your code with a spoiler flag, and clear examples of logs/test cases.