A useful course to keep your knowledge in the System Administrator field fresh.
https://www.coursera.org/learn/system-administration-it-infrastructure-services
In this course, you’ll learn about the infrastructure services that keep organizations large and small running. You’ll delve into the cloud to understand everything from typical cloud infrastructure setups to how to manage cloud resources. You will also learn how to manage and configure servers and use industry tools to manage computers, user information, and user productivity. Finally, you will learn how to recover your organization’s IT infrastructure in the event of a disaster.
