Why does `docker version` give me an error on Mac/Windows?

You likely haven't started the Docker Desktop application. The `docker` CLI tool (the Client) is installed, but the Daemon (the Server running inside the hidden VM) only boots up when you open the Docker Desktop app.

Do containers use my laptop's RAM even when they are stopped?

No. A stopped container consumes absolutely zero RAM and zero CPU. It only consumes a tiny amount of hard drive space to store its stopped state.

Can I run Windows applications inside a Docker container?

Technically yes, using 'Windows Containers' on a Windows Host OS. However, 99.9% of the industry uses 'Linux Containers'. Unless you are working with legacy .NET framework (not .NET Core) applications, you will be using Linux containers.

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Tutorials

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Installation & Hello World

Learn how to install Docker Desktop on macOS and Windows. Verify the Client-Server connection using `docker version`, and execute your first container to understand automatic image pulling and the container lifecycle.

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