Yes, it's absolutely possible to convert WordPress to HTML. The thing is a website in WordPress is dynamic in nature and once you convert it to HTML it becomes a static website. And for that, you could use WordPress plugins such as Simply Static or any other 3rd party tool for example HTTrack.
If you wish to learn web development in all its entirety, then I would recommend you to take up the Full-stack development course from Intellipaat offers you training course and guided projects.
Have a look at our YouTube video on Website on HTML or WordPress Which is Better to have better insight.