Rootless podman (or docker) is a very different thing that adding yourself to the docker group. Rootless is an advanced topic that makes networking and other fundamental aspects of the container runtime work differently so it’s harder to exploit the runtime itself. Adding yourself to the docker group just gives your account permission access the docker daemon running as root… which is a much less fundamental change.
I don’t recommend beginners to mess with rootless docker or rootless podman. Rootful podman is much more straightforward (though less well documented than docker).