SharePoint Online: Get a Document Library using PowerShell

#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"

#Variables
$SiteURL = "https://crescent.sharepoint.com/Sites/Marketing"
$DocLibraryName="Documents"

#Setup Credentials to connect
$Cred = Get-Credential

Try {
    #Setup the context
    $Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
    $Ctx.Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.UserName,$Cred.Password)
 
    #sharepoint online get document library powershell
    $DocLibrary = $Ctx.Web.Lists.GetByTitle($DocLibraryName)
    $Ctx.Load($DocLibrary)
    $Ctx.ExecuteQuery()

    Write-host "Total Number of Items in the Document Library:"$DocLibrary.ItemCount
}
Catch {
    write-host -f Red "Error:" $_.Exception.Message
}

#Parameters
$SiteURL = "https://crescent.sharepoint.com/sites/marketing"
$LibraryName = "Documents"

#Connect to the Site
Connect-PnPOnline -URL $SiteURL -UseWebLogin

#sharepoint online powershell get document library
$DocumentLibrary = Get-PnPList -Identity $LibraryName

#Get Number of Items the Document Library
Write-host $DocumentLibrary.ItemCount