Resources for HTML learning?

IF you really want to get into web development take a look at the options. There are TONS...

Some of the newer, cooler, technologies like Angular are pretty freaking awesome when it comes to web development and app development in general.

If you were to dive into learning Angular, you would also be learning NodeJS, TypeScript, Javascript, HTML, and CSS at the same time. Going even deeper into development you'll certainly want to use a database of some sorts. There are great opportunities for learning here as well. Take your pick - MongoDB, MySQL, SQLite... etc. All great and will expand your marketable knowledge by leaps and bounds.

Also - once you start down this path, you'll want to look at things like Google Firebase and Amazon Lambda. These platforms are freaking amazing and cost nearly nothing to use.

Good Luck!