The text discusses the application of Continuous Delivery (CD) and GitOps principles to infrastructure management using tools like Terraform and Codefresh, with a focus on Google Cloud. It highlights the importance of applying software development practices, such as version control and automated testing, to infrastructure since it is now often defined as code. The guide provides practical steps for setting up a CD process that uses GitOps to manage infrastructure, specifically a Google Kubernetes Engine (GKE) cluster, and emphasizes the role of pull requests in proposing, reviewing, and applying changes safely. It outlines how to set up a Codefresh pipeline to automate infrastructure changes and ensure that modifications are reviewed through pull requests before being merged into the master branch. The text also discusses the importance of managing Terraform state and describes how to store it in a Google Cloud Storage bucket to facilitate collaboration and automation.