Under the 'Installing RPM Packages' we should really explain that dnf is the preferred tool for installation even when downloaded rpm files are concerned.

• The lack of dependency resolution in rpm can lead to "RPM hell".
  https://en.wikipedia.org/wiki/Dependency_hell

• Dnf has a history database which offers rollback capability. This is bypassed when installing packages by using rpm directly.

Also, the lecture should mention rpmsort which is a new package sorting utility. The RH304 intro lesson has a good example of how to use it.