How should I practice WP development?

So I’m just a few hours into Brad Schiff’s wordpress & php [course](https://www.udemy.com/course/become-a-wordpress-developer-php-javascript/) on udemy and for now he’s explaining everything well. I’m already familiar with HTML, CSS and also JS.

For now I don’t feel like I understand the structure of wordpress a 100% maybe only 90% and I’m confused on some stuff, so what available resources can I use to practice wordpress like for example there’s [frontendmentor](https://www.frontendmentor.io/) for practicing CSS so I’m looking for something similar.

Also what best practices should I know early on so I don’t make common or rookie mistakes.

Hope anyone can help thanks!

 

This site will teach you how to build a WordPress website for beginners. We will cover everything from installing WordPress to adding pages, posts, and images to your site. You will learn how to customize your site with themes and plugins, as well as how to market your site online.

Buy WordPress Transfer