Write a compose.yaml for a web server and a checker, start both, read the result and remove them. After this, you can run a two-service project from one file.
Copy a file or folder between a container and your computer, even from a stopped container. After this, you can rescue a file before you delete the container.
Check virtualization, WSL, the docker-desktop distribution, the engine context and memory in the order that finds the cause fastest. After this, you can get a stuck Docker Desktop running without resetting it.
Check CLI resolution, the intended local context and engine connection, then run and verify cleanup of a disposable test container.
Share a folder from your computer with a container, make it read-only and see how a mount can hide files that were already there. After this, you can mount a folder and know what it will and will not keep.
Open a shell with docker exec, run one command without it and read the two errors you will meet first. After this, you can look around inside a container and know why it sometimes refuses.
Find a stopped container, read its exit code and log, and tell a crash from a kill. After this, you can see why a container stopped in under a minute.
Run a container for a single command, pass a setting in with -e and use --rm so nothing is left behind. After this, you can run a quick test in a container and leave no clutter.
Create a network, reach one container from another by name and see the same call fail on the default network. After this, you can fix a bad address error between containers.
Write a four-line Dockerfile, build it and run it, then read the errors for a missing file and a missing Dockerfile. After this, you can package a small script and fix the first build errors yourself.