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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.
my code is inefficient is there a way to make it efficient! or please tell me a source to learn
Read the description carefully and you'll find the answer.
105 test passed and only 2 failed and showing this 'NoneType' object has no attribute 'sort'
Read the documentation. This is not the right place to ask people to teach you programming languages.
how to use function sort() without returning none value
Read this: https://docs.codewars.com/training/troubleshooting
last test not returning false any suggestion
The test is ok.