Foundations guide

Docker & Containers, Demystified

A plain-English guide to Docker and containers from first principles — why containers exist and how they kill "works on my machine", the image-vs-container distinction, writing a Dockerfile that builds fast, and persisting data with volumes. Then networking containers together, Docker Compose for multi-service apps, sharing images through registries, and what changes in production. The packaging layer the whole modern toolchain runs on.