The article discusses the importance of implementing a custom IAM policy for a Lambda CI/CD pipeline using AWS SAM and GitHub.It emphasizes the need to move away from granting broad permissions and focus on the principle of least privilege.Using a custom IAM policy aligns with AWS security best practices and helps reduce security risks.Advantages of custom policies include limiting the impact of compromised credentials and increasing operational efficiency.Custom policies offer awareness of automation permissions, prevent unintended resource operations, and support compliance requirements.The article provides an example of a custom IAM policy tailored for a Lambda and API Gateway deployment pipeline.It details the steps to attach the custom policy to the role for the code build/code pipeline.The article guides through the process of pushing code changes to trigger the AWS Code Pipeline and reviewing deployment stages.It includes validation steps for invoking the deployed function and API using tools like Postman.Additionally, the article covers reviewing S3 bucket artifacts, CloudWatch logs, and emphasizes resource cleanup post-experimentation.