How to get the real error message of 500 error in WordPress (for debugging)?

Hello,
Sometimes you will encounter the 500 error when use a feature of theme or a plugin. To identify which causes the error, please follow 3 steps below:

1. Open file wp-config.php in the root folder of your website (you will need to login to Cpanel >> File Manager tool, or login to file server with FTP client software), then replace this line:

define( 'WP_DEBUG', false );

with

define('WP_DEBUG', true);
define('WP_DEBUG_DISPLAY', true);
define('WP_DEBUG_LOG', true);

Then save the file.

2. Reuse the feature which causes problem (to catch the error).

3. The detail error message will appear.

After finishing, please undo step 1.

Best regards,