Pretty much everything on the web uses HTML and CSS to some Degree.
From simple website to huge and complex web applications like Printerest and twitter, if it's on the web, it uses HTML and CSS in some capacity.
which is why learning the basics is an excellent way to start your journey learning how to code.

In this course you'll learn the fundamentals of HTML and CSS.
You'll learn how to create web pages from scratch, and link them together to create a whole websites.

Choose How you want To Learn