Summary
Try to tailor your installation to meet your Linux server's essential needs, and discard the rest. There is no prescribed set of rules for this. Ascertaining those needs is an undertaking that demands skill, organization, and clear goals. Particularly when you're employing Linux in enterprise environments, you should outline how the server will be used, who will use it, and what data it will serve.
The next chapter departs from preliminary security measures (physical security, installation, and so on) in favor of old-fashioned system administration.