Here is a free YouTube resource: https://www.youtube.com/c/WahlnetworkPage
Udemy course: https://www.udemy.com/course/terraform-beginner-to-advanced/
Coursera course: https://www.coursera.org/projects/terraform-for-absolute-beginners
Educative course: https://www.educative.io/courses/terraform-beginner-master-aws
Pluralsight course: https://www.pluralsight.com/courses/deep-dive-terraform
Another Udemy course: https://www.udemy.com/course/learn-devops-infrastructure-automation-with-terraform/
Another Udemy course: https://www.udemy.com/course/terraform-fast-track/
Udemy course (Kubernetes + Terraform): https://www.udemy.com/course/azure-kubernetes-service-with-azure-devops-and-terraform/
Udemy course (DevOps Deployment Automation with Terraform, AWS and Docker): https://www.udemy.com/course/devops-deployment-automation-terraform-aws-docker/