Server Security Hardening

Post installation, your server runs smoothly. But, are you sure about Security of your Server ? Many times administrators forget to close down unwanted functionalities or unwanted configurations of operating system which can lead to serious security issues. Control panels don't secure a server as it should, some extra efforts are needed to secure it. The benefit of these Misconfigurations are leveraged by the hackers to exploit and attack your server.

I've signuped server security hardening, now what next ?

Do you store passwords ?

Do you install any application/ scripts on the server?

While performing any downtime to server ?

You delete or remove or modify any files on server ?