PHP
I have been using PHP for over a decade and heard "PHP is dead and (insert new language here) will be taking over soon" for the entire 10 years. Not going to happen. PHP has the biggest market share in web development by miles and always will. 7.4 millions websites run PHP and thats a low ball guess. With the speed improvements in PHP 7.0 and above its crazy fast now. In the 8.0 release of PHP you will be able to run C code directly from a PHP application.
I agree with
@terrier2018 when he said python is basically dead besides computer science uses. Python is a very basic language and its used for Proof of Concepts not full on applications 99% of the time.
With conservatively 7.4 million websites running PHP, finding a job isnt hard. We get paid well.
The only other language I would recommend is NodeJs because you get to write Javascript for the front end and the back end and NodeJS is destroys any other language in raw performance.