Containers that run your app anywhere, identically.
Before any command, understand the problem containers solve.
First practical step: install Docker and run your first container.
An image is the template containers are born from — the basis of everything.
Here you learn to control the full container lifecycle.
Write the recipe to build your own image for your app.
Containers are ephemeral — volumes keep your data after they vanish.
Real apps are made of containers that must talk to each other.
Instead of running each container by hand, define your whole app in one file.
After building your image, you need a place to publish and share it.
The same image must run in dev, test, and prod with different config.
Separate the build env from the runtime image for a smaller, cleaner result.
Small, secure images build and ship faster and shrink the attack surface.
An unsecured container opens a door to attackers on your whole system.
This is where containers enter the automated path from code to production.
When containers scale up, you need a system to orchestrate and scale them.