You can make websites.

This presentation is a website!

Other websites I've made

Frameworks

Get a handle on vanilla JS before going deep into a framework. JS moves fast; a solid foundation will help you learn the next cool framework.

That said, I really like Svelte. And almost everyone uses React at work.

Where to put your websites

There are several places that will host a website for free (though having a custom URL will cost like 30 bucks a year).