Ref: https://www.youtube.com/watch?v=SLB_c_ayRMo
terraform init
terraform plan
terraform apply
terraform apply --auto-approve
terraform apply -target
terraform apply -var "aws_region=us-east-1a"
terraform apply -var-file example.tfvars
terraform destroy
terraform destroy -target
terraform state list terraform state show
terraform refresh terraform output
terraform.tfvars
environment variables
TF_VAR_name