Docker Fundamentals: theory and basic usage

▤ Summary

This article explains Docker fundamentals and basic operation for developers and DevOps users. It covers images, containers, Dockerfiles, tags, registries, volumes, networks, Compose, and common runtime commands. It also walks through practical best practices such as .dockerignore usage, multi-stage builds, health checks, non-root containers, and rootless mode. The piece ends with a roadmap to more advanced topics including orchestration, security, and internal Docker architecture.

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