I got queries from many beginners to know how they can connect Azure from PowerShell. I am assuming you have already installed the Az Module and using PowerShell Core. Here is the simple command for your reference. The below command will connect to your Azure Account and it will connect to the default subscription.
And if you have different subscriptions you have to set the default subscription with the below command.
Set-AzContext ‘Visual Studio Enterprise’
To Discover or list all the Az Module
Get-Module Az.* -ListAvailable | Select-Object Name -Unique
To discover the available cmdlets within a module we can use the Get-Command cmdlet. In this example we browse all cmdlets within the Az.Account module:
Get-Command -Module Az.Accounts
You can use the get-Help command to get the help about any specific command
If want to see a few examples against this command you can use this.
Get-Help Get-AzVM -Examples
The complete Az Module Reference can be found here