The article discusses the type conversion function in Terraform called toset(), which is used to convert supplied values into a set ensuring uniqueness and unordered nature. It explains the difference between toset() and tolist() functions, with the former converting a value to an unordered collection of unique elements while the latter preserving the order of elements. The article also provides examples on how to use toset() within a for_each loop in Terraform configurations. Additionally, it mentions Spacelift as a tool that makes working with Terraform easier and highlights OpenTofu as an open-source alternative to HashiCorp's Terraform.