What is the significance of deployment Manager in GCP?
Deployment Manager is a service that takes a written statement of infrastructure, usually in yaml format and performs the actions to make those statements become resources on the Google Cloud Platform.
The Cloud Foundation Toolkit provides a series of reference templates for Deployment Manager and Terraform which reflect Google Cloud best practices. These templates can be used off-the-shelf to quickly build a repeatable enterprise-ready foundation in Google Cloud. This frees you to focus on deploying your applications on this baseline secure environment.
There is also a lab available on the ACG Platform if you want hands on experience.