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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.
You are damn right! This is not the best practice guy. Please, be responsible and dont vote for best practices.
@cu6upb like monking said, the real problem is that your editing something that's not yours (the global string object) Which means that if somone imports your library it would at worst break their code because you've changed the way the string behaves.
It is ok however to use prototypal inheritance to make your own sub-objects and those you can edit to your hearts desire. I've never tried to do it with a built in type (besides Object) but I bet you can.