JavaScript is one of the most useful programming languages ever .. more than 85 % of websites use JavaScript ..
This language have a very big fans and it was one of the best languages because you can replace css and html using "js ", you can set and build your website with "js" you can do all your functions using "js" ..
Other benefits for this language :
Easy : you can learn JavaScript in just one week .. no need a lot a time just visit Udemy or write tutorial in YouTube then you can earn this language .. Remember that one day you'll need it because all the world now need more technology , more internet more websites then more developers :) ..