The Deploy Infrastructure as Code (IAC) course on Udacity teaches the best practices of Infrastructure as Code (IAC) in the DevOps model. It covers configuring the AWS CLI using IAM, understanding the fundamentals of CloudFormation, and comparing manual and automated provisioning of cloud resources. The course also focuses on assessing foundational resources and designing cloud architecture diagrams using real-world best practices. It covers deploying networking infrastructure using CloudFormation, including VPC, subnets, gateways, and routing. Additionally, it teaches creating security groups, centralizing server configuration, and deploying highly available servers with AutoScaling Groups. The course also covers deploying highly available RDS databases and configuring secure S3 buckets using CloudFormation. It emphasizes previewing changes to CloudFormation stacks and automating infrastructure workflows using parameterized scripts. The course culminates in a project where students apply their skills to deploy a high-availability web app using CloudFormation, including infrastructure diagram design, CloudFormation deployment, and script automation.