Docker explained: how containers workDocker explained: what containers are, how Docker Engine uses Linux namespaces and cgroups, how images, Dockerfiles, and Docker Compose fit together, and how Docker compares with virtual machines.Kubernetes explained: how container orchestration worksKubernetes explained: what K8s is, how the control plane and worker nodes work, what pods, services, and deployments are, and how Kubernetes orchestrates containers at scale.Containers vs Virtual Machines: which should you choose?Containers and virtual machines both isolate workloads, but they do it in fundamentally different ways. Compare architecture, performance, isolation, security, and use cases to pick the right one for your application.What is a canary deployment? How canary releases work and when to use themA canary deployment rolls out a new version to a small subset of users first, then gradually expands if metrics stay healthy. Compare canary vs rolling update vs blue-green, learn the metrics to watch, and see when this progressive-delivery pattern fits your team.How to use Docker Compose: multi-container apps explainedLearn Docker Compose to run multi-container apps from one YAML file: services, networks, volumes, health checks, Compose Watch, env vars, docker compose up and common commands — with a real Node.js example.How to containerize a Node.js app with DockerContainerize a Node.js app with Docker: write a Dockerfile, use base images and multi-stage builds, expose ports, manage dependencies and environment variables, and run your container locally — open-license sources.Docker vs Kubernetes: which one do you need?Docker and Kubernetes solve different problems: Docker packages and runs one application in a container, while Kubernetes orchestrates many containers across a cluster of machines. Compare what each does, when you need orchestration, and how to choose. 