Anyplace to get more practice with podman and what not I don't feel confident enough to continue through the material for DO180 at this point w/o more practice. (At the end of chapter 3.)
The Red Hat Developers web site (developers.redhat.com) contains many blog posts that use podman, some of them with sample code and detailed instrutions. Look also for blog posts related to the Universal Base Image. And there is 'man podman', 'man podman run', etc.