Try my two favourite PowerShell learning resources, courtesy of Microsoft Virtual Academy. They’re getting on a bit, but good content ages slowly.
Getting Started with Powershell 3.0 Jump Start
and
Advanced Tools and Scripting with Powershell 3.0 Jump Start
They feature Geoff Snover, the father of PowerShell, and MVP Jason Helmick in a genuinely warm and entertaining back-forth and are an exemplar for how technical content should be presented online. Even if you don’t much care about PowerShell, I still think you should have a look.