Comprehensive guide covering Docker fundamentals from container image creation to production deployment. Explains Dockerfile instructions (FROM, RUN, CMD, ENTRYPOINT, COPY, ARG, ENV), multi-stage builds, container registries, and image optimization techniques. Demonstrates container lifecycle management including launching, inspecting, logging, and resource monitoring. Covers Docker Compose for declarative container orchestration, with practical examples for development and production environments. Includes advanced patterns like using supervisord for multi-service containers, variable replacement in config files, and proxy configuration.