I found this GitHub - docker/getting-started: Getting started with Docker
When you click on the Docker icon on Mac in the status bar (top right corner) there is a “Quick start guide”. When you follow the instructions, one of the first steps is to pull the above repository in container called “repo”. Then you get the interactive terminal where you can press enter and copy out the “getting-started” folder from the container to your home, but you could change the target folder before pressing enter. You probably tried that tutorial once, but it is completely safe to delete that. When you need it again, you can start the “Quick start guide” again.