I'm not one of the down votes, but I read their comment as missing the point of the question. These types of questions rarely are asking "should I use C or Java

I'm not one of the down votes, but I read their comment as missing the point of the question. These types of questions rarely are asking "should I use C or Javascript for a web front-end?" so saying "different languages are for different purposes" means nothing. The question, while admittedly unclear, is most likely asking "does it matter if I use Python or Ruby" or "Perl vs PHP" or "C++ or Swift" or "Clojure or Haskell". There are a lot of languages that, for the most part, are completely interchangeable. That makes it nice for choice, but also makes it hard to decide which language to focus on.