This tutorial demonstrates how to securely access AWS from HCP Terraform using OIDC federation, eliminating the need for access keys. By setting up an OIDC provider and dynamic provider credentials, users can authenticate with IAM roles and obtain temporary security credentials for each run. The process involves creating an OIDC provider, setting up an example IAM role, and using environment variables to enable HCP Terraform to assume the IAM role at runtime. Additionally, implementing access management for your AWS organization is recommended for improved security and scalability.