ImportAndExportSPSite

You can easily create an instance (a template) from your SharePoint online site including lists,document libraries,settings,users,content types and export it to another SharePoint online site.

First create a self signed certificate

in powershell run below command

$cert=New-SelfSignedCertificate -Subject "CN=CompName" -CertStoreLocation "Cert:\CurrentUser\My" -KeyExportPolicy Exportable -KeySpec Signature -NotAfter (Get-Date).AddMonths(24)

Second export your recently created certificate in addition to private key

in run -> mmc -> Certificates - Current User -> Personal -> Certificate

in certificate right click select All tasks then export

Third create an app registeration in Azure portal

In the Certificates and Sectrets -> select certificates -> upload your self signed certificate.

Fourth get client Id, Tenant Id

Go to overview section and get the client id and tenant id and replace it in console app.