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I advise you to learn Javascript because first, it's the unique language available front side and you can also use it server side if you want.
After that, you can learn other languages most used like Java, C# or php. I will be easier for you to find a job with this previous language unlike exotic languages as Windev Pascal or COBOL.
Just choose which you prefer. In my view, I prefer Java and C#, and there are the two one the most asked.
