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If I had to start with Docker (in 2026),
I'd learn these concepts:
Docker is a container platform to build, package & run apps in isolated environments.
• Docker packages an application, its dependencies & configuration into an image.
• A container is a running instance of that image.
• Containers share host's Linux kernel instead of running their own kernel.
• Docker uses Linux namespaces to isolate processes, filesystems & networks.
• Docker uses cgroups to control CPU, memory & other resource usage.
• Images are built from reusable layers, which makes builds, storage & downloads efficient.
• Containers are lightweight, start quickly & run consistently across laptops, servers, and cloud environments.
What else would you add?
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👋 PS - Want a deep dive into how Docker works?
Read this letter right now:
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