There are various errors that users can encounter if there is any issue related to the PHP memory. If the memory gets exhausted, you can see WordPress errors that include internal server errors, image uploading error, error 404, and many more. The best way of fixing this memory problem is to increase memory limit WordPress. All you need to do is increase the memory up to the standard limit set by the web hosting and WordPress.
Sometimes, new users of WordPress don't know about how to increase the memory. So, first of all, you need to edit the wp-config. PHP file that is on your WordPress site. You can see this file in the WordPress site's root folder. Now, you just need to use an FTP client or file manager from the web hosting control panel. Then make sure to paste the code in wp-config.