Language learn after HTML, CSS and JAVASCRIPT

Answer 1

/* Credits to femyk */
The next "language" or "framework" or "library" that you should learn depends on the kind of Web Developer you want to become...::
Front End Developer
[Languages]
• HTML
• CSS
• JavaScript
[Libraries]
• jQuery
[Frameworks]
• Bootstrap
• Angular.JS
• React.JS
Back-End Developer
[Languages]
• PHP
• SQL
[Libraries]
• Node.JS
[Frameworks]
• Ruby on Rails
I advise that you pick the ones according to your interests...

Answer 2

PHP AND THAN SQL :)

Answer 3

SQL and Ruby, Python or PHP