What are the best set of languages to learn complete Web development?

Answer 1

Adding some useful Javascript frameworks:

p5.js
Box2d.js
less.js
Matter.js
triple.js

Answer 2

html, css(bootstrap), javascript,(jquery, AngularJS, node.js) php, SQL... Also CEO/Marketing and W3C validation. I think someone with these skills, can already be considered a complete Web Developer

Answer 3

There are many languages to learn, to become a full stack web developer.

In simple road map :

For frontend development :-
-HTML
-CSS
-JAVASCRIPT/JQUERY

For backend development:-
-PHP with at least one framework(Codeigniter, laravel, cakePhp etc)
-Ajax with php
-MySql for php

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You can go further in different technologies, like.
-MEAN stack (MonoDB Express.js Angular. js Node. js)
-React.js
-ASP.NET
-Meteor.js