Yum Groups
The Fedora 18 installer does not allow single package installations, instead it prefers to install by package groups. You can also install groups after completing installation. This is especially useful since you can only select one Desktop Environment at installation. Alternatively, to have faster installations, select as few groups as possible and then only install the ones you need later.
This is just a quick note on how yum can install by groups instead of by individual packages.