Further Reading
By no means is this chapter a tutorial on using PowerShell. But if you want a better understanding of the examples, or want to learn more about PowerShell, we can recommend you read Mastering Windows PowerShell Scripting – Second Edition (ISBN: 9781787126305), by Packt Publishing. We suggest that you start with the second chapter, Working with PowerShell, and continue until at least the fourth chapter, Working with Objects in PowerShell.
You can find plenty of online documentation about using SSH. A very good place to start is this wikibook: https://en.wikibooks.org/wiki/OpenSSH.
If you wish to explore more about Linux administration, Linux Administration Cookbook by Packt Publishing is a good resource, especially for system engineers.
To dive deep into security and admin tasks, this is a good read: Mastering Linux Security and Hardening, written by Donald A. Tevault and published by Packt Publishing.