Packages have been sorted into groups, to make choosing what you need on your system a lot easier. The groups are fairly self explanatory, however more information about the content of each is available in tool-tips which become visible as the mouse is hovered over them.
Workstation.
Server.
Graphical Environment.
Individual Package Selection: You can use this option to manually add or remove packages.
Read the section called “Minimal Install” for instructions on how to do a minimal install.