tp_cloud/terraform/modules/network/outputs.tf

output "vpc_id" {
  value = google_compute_network.my_new_vpc.id
  description = "VPC ID"
}

output "subnet_ids" {
  value = {
    frontend = google_compute_subnetwork.frontend.id
    backend  = google_compute_subnetwork.backend.id
    database = google_compute_subnetwork.database.id
  }
  description = "subnetworks ids"
}