Doppler is a secrets management tool that combines dynamic secrets and automatic rotation, keeping credentials up to date and secure. It uses two rotation methods: issuer rotation and updater rotation. Depending on the service's approach to rotating secrets, Doppler performs rotation through proxied rotation or API rotation. To set up rotated secrets in Doppler, users need an AWS account, a GitHub account, and a Doppler account. The process involves creating a workplace ID, activating the Team trial plan if needed, setting up policies on AWS, creating IAM roles and users, and configuring Doppler for rotated secrets. Once set up, users can manually trigger the pipeline to deploy the microservice to AWS using GitHub Actions. The tutorial highlights industry best practices for secure and efficient secrets management, including using short-lived secrets, applying least privilege control, centralizing secrets management, monitoring and auditing secret usage, and taking control of secret security.