In order to understand how SitecoreDXG works, it is suggested that you review the information in the Architecture section before continuing. However, if you wish to get started quickly then the short version is that SitecoreDXG works by using a middleman to retrieve the serialized data from Sitecore and kick off the generation process. At the end of the process, optional completion handlers can be executed to "do something" with the generated output, or you can leave the generated output in the SitecoreDXG output directory for later review/use.