The first command I would like to try and remember is Get-Command
Get-Command Get-Service -Syntax
Syntax adds a how-to feature that allows you to see the different parameters that can be used with the command.
Compress-Archive compresses a file into a zip file.
Compress-Archive -Path c:\temp -DestinationPath c:\temp\myfile.zip
To expand the archive do the following:
Expand-Archive -Path c:\temp\myfile.zip -DestinationPath c:\temp\powershell
Example of Get-Help
Get-Help Get-Process -Full
Get-Content C:\Temp\misc.txt | Measure-Object -word | Select-Object words