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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.
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As Chrono said, theres just a slight syntactical difference (parentheses "()" vs brackets "[]") that Python treats very differently as two different types of data structures: lists and tuples.
The most basic difference is that lists are mutable (you can rearrange the order of things inside them) and tuples are not.
That said, there are other differences that are important when deciding which to use. Here's docs with more information: https://www.geeksforgeeks.org/python-difference-between-list-and-tuple/
That's because lists and tuples aren't the same thing. Not a kata issue, use question label next time.
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Kata was asking for XOR operator exclusively i believe.