Understanding Terraform stacks

Suppose you are working with one of your colleagues, John. You and John have been assigned to deploy 50 virtual machines, 20 virtual networks, 10 web apps, and 5 function apps in Azure. You have many questions about this infrastructure deployment in Azure, such as how you will provision this whole infrastructure, what will be the easiest way to perform the deployment, and how you would you scale this infrastructure up or down if, in the near future, the addition or deletion of resources needs to be performed. In response to these questions, John says that you should be able to use Terraform configuration files for the deployment and management of the complete infrastructure. He also suggests writing Terraform modules for each resource and getting them published to GitHub or Terraform Registry; then, later on, stacks of the infrastructure can be prepared by referencing the modules. Preparing these stacks for infrastructure provisioning and management would...