Debug Errors, site health

You should be looking for the wp-config.php file in the root of your WordPress installation. From the documentation in the WP_Debug Section

WP_DEBUG is a PHP constant (a permanent global variable) that can be
used to trigger the “debug” mode throughout WordPress. It is assumed
to be false by default and is usually set to true in the
wp-config.php file on development copies of WordPress.

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error code: 523