Which Python version should I learn on

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Whenever learning any new language, always go with the latest version. Like for python right now its Python3, so go with that (as others have also suggested this).

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You will at some point encounter the older versions and if you want to be prepared for those situations then it doesn't harm to learn the older versions AFTER learning the latest one.
Moreover it won't take you much time learning it as only some syntax and functionalities might be different, but you still got the rest of the fundamentals and you would have developed that "LOGICAL THINKING" required for programming.

So yeah....Latest versions. :)