No problem! Let me know if you have questions. Docker was new to me a few years ago, now I work with it professionally.

You need to learn how to write a Dockerfile (plenty of guides online). Not that a Dockerfile is different from a compose.yaml file (in development I use both).

Do you remember what the original was?

This is a common misconception. Podman has similar commands to Docker CLI but it’s not a “drop-in replacement”. Depending on your usage, you might run into things that don’t work the same.