Nice introduction to PowerShell! For a bit more geared toward those interested in SQL Server and PowerShell, I wrote a two-part introduction entitled Practical PowerShell for SQL Server Developers and DBAs that shows, among other cool features, how to navigate in "SQL space" just like you can navigate in a file system. See https://www.simple-talk.com/sql/database-administration/practical-powershell-for-sql-server-developers-and-dbas-%E2%80%93-part-1/