If you want to make your website security more robust, you need to think about hardening. To harden your website means to add different layers of protection to reduce the potential attack surface. Hardening often involves manual measures of adding code or making changes to the configuration. To virtually harden your site involves allowing a Web Application Firewall (WAF) or security plugin to automatically harden your website.
The concept of hardening is part of a defense-in-depth strategy that protects your web server and database from vulnerability exploitation.