What order languages I need to learn to become a web developer?

Answer 1

First of all HTML is necessary
Front end : HTML, CSS , JavaScript.
May be js frameworks like Angular.js or React.js
Back end : HTML, PHP/SQL/Node.js (Learning all is not necessary)
Full stack : I recommend to learn first Frontend first then Backend

Answer 2

HTML, CSS, JS, PHP.

Answer 3

You have 3 options:
1. full stack: 2 + 3 + DBMS
2. front-end: HTML, CSS, JavaScript, js frameworks (Angular, reactjs, ...)
3. back-end: PHP or Nodejs or ASP.net or ...

hint: DBMS: SQL server or MySQL or MongoDb or ...