I would like to add contacts from PowerShell using the New-MailContact cmdlet.

Please tell me how to use this cmdlet in order.

I don't know how to use this cmdlet, but
I think it's probably the web version.
Perhaps the contributor would like to register his contact information with the offline version of Outlook
(I'm sorry if I'm wrong.)
In that case, you can use the following code:

#Set-MailContact

$outlook=New-Object-ComObject Outlook.Application

# https://docs.microsoft.com/en-us/office/vba/api/outlook.olitemtype
#olContactItem2
$objContact=$outlook.CreateItem(2)

$objContact.FullName="powershellTest"


$objContact.Save()

Please let me know if you know any books or sites that can be helpful when operating MS products on PowerShell

The current situation is that there are no good books.
So, I'll show you how I studied.

"First, ""Implement"" or ""Refer to the source code on the web"" what you want to do with VBA."
Then rewrite it with powershell.When rewriting, use New-Object-ComObject to
Create an Excel or Outlook object.

That's all.