Web design

Question

must i know html,css,php,javascript to design and ran a website..i want to learn html,css,php only

Answer 1

You can learn web design with HTML/CSS only :)

Answer 2

PHP allows you to create dynamic web pages just like JavaScript (Facebook is made with PHP). However JavaScript is a client-side language, unlike PHP which is a server-side language.
I am not sure if you would have it easier to code a rich and interesting website in PHP rather than JavaScript since with the latter you can readily manipulate the structure of a page (just check out the JavaScript SoloLearn course), and I am too sure about the former (as far as I recall there is nothing on that topic in the PHP SoloLearn course).

JavaScript is hardly my favourite language, but I do not understand why you are trying to avoid learning it but you are perfectly fine with studying all those other languages.