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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 can do whatever you want in your code.
Not at all (and I can't remember a single kata where it would be the case).
See https://en.wikipedia.org/wiki/Node_(computer_science).
As for "why don't we speak 'Node' much when using python", I would suggest u read a similar question on so, it answered my similar concern.
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