Don't hardcode your secrets in Kubernetes manifests, and other container pitfalls to avoid` is a blog post that highlights common mistakes when using containers and Kubernetes. The author shares their experiences with authentik, an open-source Identity Provider, on how they test and deploy the service using containers, Helm charts, and Kubernetes. Key takeaways include not hardcoding secrets in manifests, configuring Helm charts for customization, reviewing and updating Kubernetes resources, setting up firewall rules from the outset, and considering a sandbox environment for testing infrastructure configurations. The post emphasizes the importance of security, automation, and sanity in container deployments.