The tutorial provides a step-by-step guide on building an automated HashiCorp Vault onboarding system with Terraform, using sensible naming standards, ACL policy templates, pre-created application entities, and workflows driven by VCS and CI/CD. The key benefits of this approach include repeatability, version control, and automated workflows, which increase productivity and mitigate risk. By codifying Vault configurations, companies can onboard applications hundreds of times through a single, automated workflow. The tutorial covers the process milestones, Terraform configurations, application integration with Vault, onboarding the next application, automating the workflow using Terraform Cloud/Enterprise, testing and promotion using Terraform modules, and recap with additional resources.