instruction: Create a Dockerfile for fundamentals
output: ```dockerfile
  from the host.After a few seconds, open your web browser to http://localhost:3000.
  You should see your app.
  Add an item or two and see that it works as you expect. You can mark items as complete and remove them. Your frontend is successfully storing items in the backend.At this point, you have a running todo list manager with a few items.If you take a quick look at your containers, you should see at least one container running that's using the getting-started image and on port 3000. To see your containers, you can use the CLI or Docker Desktop's graphical interface.
  CLI
  
  Docker DesktopRun the docker ps command in a terminal to list your containers.
  
  $ docker ps
  Output similar to the following should appear.
  
  CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
  df784548666d getting-started "docker-entrypoint.sâ¦" 2 minutes ago Up 2 minutes 127.0.0.1:3000->3000/tcp priceless_mcclintock
  In Docker Desktop, select the Containers tab to see a list of your containers.
  SummaryIn this section, you learned the basics about creating a Dockerfile to build an image. Once you built an image, you started a container and saw the running app.Related information:Dockerfile referencedocker CLI referenceNext stepsNext, you're going to make a modification to your app and learn how to update your running application with a new image. Along the way, you'll learn a few other useful commands.Update the application
  Request changesTable of contentsPrerequisitesGet the appBuild the app's imageStart an app containerSummaryNext steps
  
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