Keep file/folder permission appropriate for file and directory protection

All files should have a proper CHMOD configuration. Preferably,
The most important part of having a secured Joomla website is to set the right permissions for your Joomla files and folders. We recommend that you follow these suggestions for your permissions:

Set the permissions for your Joomla folders to 755

Set the permissions for your Joomla files to 644

Set the permissions for your configuration.php file to 444

Never use 777(full access) permissions!