Why html is useful

Answer 1

You can do the html course to find out how it is used:
https://www.sololearn.com/Course/HTML/?ref=app

Answer 2

HTML and CSS are the foundations of the web. HTML—“HyperText Markup Language”—is the language used to tell your web browser what each part of a website is. So, using HTML, you can define headers, paragraphs, links, images, and more, so your browser knows how to structure the web page you’re looking at.

CSS—“Cascading Style Sheets”—is the language that gives those web pages their look and formatting. In other words, CSS is what you use to make sites look nice with fancy fonts, rich colors, gorgeous backgrounds, and even slick animations and 3D effects.

Answer 3

Html is the soul of web, web is soul of Google and other million websites, Google is the soul of android, android is the soul of phone OS.
That's why html is important.
😎😎