How to make responsive website

Answer 1

take CSS courses to understand it better or use a framework like bootstrap:
https://getbootstrap.com/

Answer 2

I can't understand bro

Answer 3

Search media query lesson/corse on youtube.
It is part of css which allow you to make your page responsive.

You can also join css flexbox course or css grid corse for responsive webpage designing.

Some frameworks like bootstrap and materialize as easy Syntex to make webpage responsive.