In RHEL 8, RH124, on the very first page of content (on Gilmore), it says, under Classroom Environment, "The root password on all student systems is redhat."
This is incorrect -- at least when using NDG's NetLab. The root password on workstation and the server machines is unknow to all (not even the instructors know it).
We aren't using a physical lab, yet (we're teaching this class in Fall 2020), so I can't say if the root password is redhat in that environment.
However, I suspect that it isn't. The content in Chapter 6, section 3 (indirectly) and the lab in Chapter 6, section 4 (directly) talk about using sudo su - as a way to log into the root account because the root password in unknown.
Program Lead at Arizona's first Red Hat Academy, est. 2005
Estrella Mountain Community College