To create a good website which all languages should I know?

Answer 1

well, in creating a website good your work could be done with html+css+java script. And rest is the most crucial, your creativity.

But i would like to suggest you reading more about something called WEB VR.
Virtual Reality in creating website is a rising field where you can experiment your creativity in 3D.
for WEB VR you may refer e.i @ www.aframe.io .

Answer 2

html, css, javascript, and some backend language like python, java, php, etc

Answer 3

HTML
CSS
JS
server side:
PHP
IQR
SQL