The format for using an output attribute from a resource is ... In the VPC id example, we are getting the output from an aws_vpc resource type, with the identifier name my_vpc, and we want to get the id attribute value. Thus, we end up with aws_vpc.my_vpc.id. It is worth noting here that this syntax was greatly simplified in Terraform version 0.15 (which is the syntax all of the examples in this course will be using).