Linux is just the operating system (OS), you have an OS to run services, it is important you can manage not just Linux but it's essential services. In this course, Ubuntu Linux Administration: Service Configuration, you'll learn to deploy, manage, and configure essential services in Linux. First, you'll explore a web server. Next, you'll discover how to deploy an email server. Finally, you'll learn how to configure and manage DNS. When you're finished with this course, you'll have the skills and knowledge of service management needed to manage Linux in an enterprise environment.
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https://www.pluralsight.com/courses/ubuntu-linux-administration-service-configuration-cert