Get-Help is the most helpful command there is.
It exposes inline help for commands and about topics built into the system.
Get-Help is part of the trinity of discoverability.
To get general help about PowerShell, we can use:
Get-Help
To get help about a particular command, we can use:
Get-Help Get-Help
If a command has a .Link, the first link will give you online help.
Get-Help Get-Command -Online
This will bring you to microsoft’s get-command help
To get help about a particular topic, we can use:
Get-Help about_Variables