The best way to learn Docker is by doing. Read the quick primer below, then launch a full-screen, hands-on lab that grows with you — from your very first command as a beginner all the way to volumes and cleanup. Each step asks what you need to do; you type the answer in a safe, simulated terminal that checks your work instantly.
~25 min · 18 guided steps · Beginner → Advanced
A quick primer before you jump in. Skim these, then head to the terminal.
Docker packages an application with everything it needs — code, runtime, libraries and settings — into a single portable unit called a container. It runs the same on your laptop, a teammate's machine, or production, killing the classic "it works on my machine" problem.
Read the intro tutorialA container is a lightweight, isolated process created from a read-only template called an image. Unlike heavy virtual machines, containers share the host OS kernel — so they start in seconds and use far fewer resources. You can run dozens at once.
Explore containersA safe, simulated Docker environment that runs entirely in your browser. You type real Docker commands and see realistic output — but nothing runs on your computer and nothing can break. Guided steps check your work and track your progress automatically.
Jump into the lab18 bite-sized, auto-checked challenges that build on each other — from your first command as a beginner all the way to advanced volumes and cleanup.
How do you check which version of Docker is installed?
Print the installed Docker version.
How do you see a summary of your whole Docker system?
Show system-wide Docker information.
How do you download an image named hello-world from Docker Hub?
Pull the official hello-world image.
How do you list the images stored on your machine?
Show all local images.
How do you create and run your first container from hello-world image?
Run a container from the hello-world image.
How do you see containers that have already exited?
List all containers, including stopped ones.
How do you pull the official nginx web-server image?
Download the nginx image.
How do you run nginx in the background on port 8080?
Run nginx detached, named "web", mapping 8080→80.
How do you list only the containers that are running?
Show running containers.
How do you read a container’s log output?
View the logs from the "web" container.
How do you run a command inside a running container?
Execute "ls /" inside the "web" container.
How do you inspect a container’s low-level details?
Inspect the "web" container.
How do you gracefully stop a running container?
Stop the "web" container.
How do you start a stopped container again?
Start the "web" container back up.
How do you pass an environment variable to a container?
Run an alpine container with MODE=prod set.
How do you create a named volume for persistent data?
Create a volume called "appdata".
How do you force-remove a running container?
Force-remove the running "web" container.
How do you delete an image you no longer need?
Remove the nginx image.
The left panel teaches a Docker concept, then asks what you need to do — with a hint on standby if you get stuck.
Work out the command and type it yourself. The simulated Docker daemon responds just like the real CLI.
When your command hits the goal, the step turns green, the progress bar fills, and the next step unlocks.
Yes. The Docker playground is 100% free with no sign-up, no credit card and no downloads. Just open the page and start typing Docker commands in your browser.
No. Nothing is installed on your computer. The playground runs a safe, simulated Docker daemon entirely in your browser, so you can practice real docker commands without Docker Desktop or a server.
It is a high-fidelity simulation. You type real Docker commands (docker pull, docker run, docker ps, docker logs, volumes and more) and get realistic output — but nothing runs on your machine, so you cannot break anything.
The guided lab covers the full lifecycle: checking the version, pulling images, running containers, publishing ports, reading logs, exec-ing into containers, inspecting, using environment variables and volumes, stopping, starting and removing containers and images.
Absolutely. The lab starts at the very beginning and grows step by step into intermediate and advanced topics, so it builds your Docker muscle memory gradually — no prior experience required.
About 25 minutes for all 18 steps, and your progress is saved automatically so you can pause and come back anytime.
No setup, no downloads, no risk. Jump straight into the terminal and start learning Docker by doing.
Launch Playground →