In the main.tf file there's the provider block that shows I used the Google provider for GCP.
I used several modules for the provisioning.
I used the gke_auth module to configure authentication and authorisation for the cluster, gcp_network module to create a VPC dedicated to the cluster, gke module to provision the cluster itself.
The google_compute_instance resource is to provision the gce vm.
The varible.tf fle is to define parameters for the cluster and the output.tf file is to define output
Run terraform init to initialize terraform
terraform plan
The output is a detailed summary of resources that will be creater
terraform apply
This would create the resources in the specified project-id