You are querying about the best course to learn WordPress for web design.

Actually, the answer to this question depends on what you want to learn and achieve.

However, it’s an easy process to learn WordPress for web design. Here is how it is,

Start by designing any layout or shape for website

Try to generate a design for HTML/PHP templates

Know the anatomy of WordPress template in detail

Give a try to WordPress hooks

Once you are familiar with all of these simple steps, then you can easily learn WordPress.

https://w3schools.com – This is about hardcoding

You can search about WordPress tutorials. There are a lot. I can not recommend. That is up to your preference.