1. White screen of death (WSOD): This error occurs when your website appears as a blank white screen with no error message or content.
2. Internal server error: This error occurs when your website’s server encounters an issue but is unable to identify the specific problem.
3. Error establishing database connection: This error occurs when WordPress is unable to connect to the database where your website’s content is stored.
4. 404 page not found error: This error occurs when a visitor tries to access a page on your website that does not exist.
5. Syntax errors in WordPress: This error occurs when there is an issue with the coding of your WordPress theme or plugin.
6. WordPress memory exhausted error: This error occurs when your WordPress website uses more memory than your server can handle.
7. Connection timed out error: This error occurs when the server takes too long to respond to a request from your website.
8. WordPress login page refreshing/redirecting issue: This error occurs when you are unable to log in to the WordPress dashboard because the login page keeps refreshing or redirecting.
9. WordPress maintenance mode error: This error occurs when WordPress is updating or performing maintenance tasks on your website.
10. Plugin compatibility issues: This error occurs when a WordPress plugin is not compatible with your website’s theme or other plugins, causing conflicts or errors.

And How to Fix Them:

1. White screen of death (WSOD): To debug this error, you can try enabling WordPress debugging by adding the following code to your wp-config.php file: define( ‘WP_DEBUG’, true ); This will allow you to see any error messages that may be causing the issue.
2. Internal server error: You can check the server error logs to see if there are any specific error messages that can help you identify the problem. You may also want to check if any recent changes or updates may have caused the issue.
3. Error establishing database connection: To debug this error, you can check your wp-config.php file to ensure that the database name, username, and password are correct. You can also try repairing your WordPress database by accessing your site’s cPanel or PHPMyAdmin and running a repair function.
4. 404 page not found error: To debug this error, you can check if the page URL is correct and if the page exists. You can also try resetting your website’s permalinks in the WordPress dashboard.
5. Syntax errors in WordPress: To debug this error, you can check the code for any syntax errors using an IDE or text editor that highlights syntax errors.
6. WordPress memory exhausted error: To debug this error, you can increase the PHP memory limit by adding the following code to your wp-config.php file: define( ‘WP_MEMORY_LIMIT’, ‘256M’ ); You can also try disabling any plugins that may be using excessive memory.
7. Connection timed out error: To debug this error, you can try increasing the timeout limit by adding the following code to your .htaccess file: php_value max_execution_time 300 You can also try optimizing your website’s code or server settings to reduce the server response time.
8. WordPress login page refreshing/redirecting issue: To debug this error, you can try clearing your browser cache and cookies. You can also try disabling any security plugins that may be blocking your login attempts.
9. WordPress maintenance mode error: This error occurs when WordPress is updating or performing maintenance tasks on your website. You can wait for the maintenance tasks to complete or try manually deactivating any maintenance plugins.
10. Plugin compatibility issues: To debug this error, you can try disabling one plugin at a time to identify which plugin is causing the issue. You can also try checking the plugin documentation or contacting the plugin developer for support.