Fred Weinmann gives us a reading list of Powershell built-in documentation:
Newcomers to PowerShell are often faced with a lot of things to learn, a lot of disorienting features and little in the way of obvious guidance. While there are quite a few good books out there by now, finding the right one is not always easy.That said, PowerShell comes with a lot of built in documentation:Get-Help about_*Will list a whole lot of articles explaining many a concept, but finding just what you need – especially before you know all the right words to search for – is a lot harder.
There’s a lot to this and more seasoned developers can skip a lot of it, but if you’re just learning about Powershell, I think it’s a nice ordering of where to start learning.