In my post on exploring PowerShell, I jumped right in to exploring PowerShell.
If you're on Windows, you already have PowerShell, and you can follow along.
If you're on OSX, the easiest way to install PowerShell is
$ brew cask install powershell $ pwsh
There are more details at Installing PowerShell Core on macOS (docs.microsoft.com).
On Ubuntu, it's
$ sudo apt-get install -y powershell
There are more details, and instructions for other distributions at Installing PowerShell Core on Linux (docs.microsoft.com).