Securing fresh server

I'm thinking of renting a dedicated server which will be used for gaming purposes only. So lets first get the facts straight: i'm a total n00b when it comes down to dedicated servers and securing them.

Let's just act like i already own the dedicated server running Linux, what do i have to do know to secure it against "anything" that is not welcome? I understand you can't secure your server for 100% but what steps do i have to take? What programs do i have to run/buy etc?

If someone has time to reply to this, its greatly appreciated Securing fresh server

 

 

 

 

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