Fedora Magazine - https://fedoramagazine.org/working-modules-fedora-28/
The recent Fedora Magazine article entitled Modularity in Fedora 28 Server Edition did a great job of explaining Modularity in Fedora 28. It also pointed out a few example modules and explained the problems they solve. This article puts one of those modules to practical use, covering installation and setup of Review Board 3.0 using modules.
To follow along with this article and use modules, you need a system running Fedora 28 Server Edition along with sudo administrative privileges. Also, run this command to make sure all the packages on the system are current:
sudo dnf -y