Although, I think it’s something that might be approached better when there’s something you want to accomplish through it. For example:
You want to create a new user, search for “cPanel how to create a new user”. I would approach it on an as needed basis like this, when you need to make changes to your site or domain.
If you want to learn more about coding HTML and CSS you can begin the freeCodeCamp curriculum: https://www.freecodecamp.org/learn/2022/responsive-web-design/
That is a very straightforward path and I would recommend it. You will learn a lot about coding, but not administration really. Coding will help you everywhere in an IT career though.