These days more and more applications are moved to, or created on purpose for the Cloud. Having secure authentication and authorization is crucial in this landscape of distributed systems. If you want to learn more about IAM concepts for the cloud-native world, in this talk we are going to show you concepts like OIDC, OAuth2, and how to secure a microservices environment deployed in a Kubernetes cluster using open source technologies. We will also show you the state of IAM tools, focussing especially on Keycloak.X, the new generation of open source IAM, and its impacts for users and developers.