As @Kasey Speakman stated; frameworks dont matter; the language/s do. You know JS now and that is a solid foundation. Since it is the foundation of client side technologies. In my opinion learn Python. Not only is it an excellent language for data science based logic it is also a very easy to pick up server side language. Just be sure to understand 2.x VS 3.x changes.
Never pass up the opportunity to learn new skills. Skills make you valuable.
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As @Kasey Speakman stated; frameworks dont matter; the language/s do. You know JS now and that is a solid foundation. Since it is the foundation of client side technologies. In my opinion learn Python. Not only is it an excellent language for data science based logic it is also a very easy to pick up server side language. Just be sure to understand 2.x VS 3.x changes.
Never pass up the opportunity to learn new skills. Skills make you valuable.