What i'm doing wrong?

Someone will say what is the problem here? How to make h1, h2, h3 responsive?

Hi there! My advice would be to make use of bootstrap classes such as container. You can read about it here: https://getbootstrap.com/docs/4.0/layout/overview/#containers. My guess is if you put your whole content in a “div” with class “container” your problem may be solved. But I don’t know for sure.