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Probably JavaScript at first if you're web app focused. Then either expand to NodeJS or learn another language for the back end like Ruby, Python, Java (which i

by surge 12y ago

Probably JavaScript at first if you're web app focused. Then either expand to NodeJS or learn another language for the back end like Ruby, Python, Java (which is not JavaScript), C#, PHP etc. One you learn a language or two, picking up more becomes exponentially easier as the majority of the concepts transfer.