Previously, you learned only about developing themes & plugins along with a few other advanced concepts. While some may feel that it is enough for getting started with WordPress development, we feel that it would be bad on our part if we don’t help you learn to debug.
Xdebug is a simple solution that can help you debug the PHP code you’ve written for WordPress. Check it out at xdebug.org.
The easiest way to use Xdebug is by integrating it with your code editor. Check out the below links to find how to integrate Xdebug with your code editor/installation environment.