If you want me to suggest which one is better to learn first, I would suggest starting with python as it has a good market in the IT industry and also easy to learn.
Otherwise, both Python and JavaScript languages have very minimal differences because you can do almost everything with both Python and JavaScript languages since they support similar like lexically scoped, object-oriented, interpreted, functional and imperative programming. If any feature is missing in any language, there are many existing libraries and other extensions to achieve whatever required. I recommend to start with Python, check out this Python Online Course by Intellipaat to learn Python.
You can watch this video on Python vs JavaScript to understand more:
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