It is rare that you’ll actually need to install X.Org by hand, as X.Org is typically installed during initial system installation for systems that plan to use X. Most Linux distributions include X.Org packages on the installation media so you can install them from there using your distribution’s choice of package managers.
Some applications might require that you install a new release or development version of X.Org that is not available as a package. In these cases, you can download the source files or precompiled binaries from X.Org mirror websites. Refer to Chapter 5 for more information on installing applications from packages or source files.