Almost every tutorial or documentation I see explaining a gradle build file setup includes a buildscript section near the top of the file. However, most real projects I see do not have this section. Also, when a buildscript section is included, there seems to be two repositories sections and dependencies sections in the file.
My questions are; What exactly is the buildscript section and why does it appear to be optional? If it truly is optional then why does most documentation related to the subject imply it isn't? Regardless of it being optional or not, why do several sections appear to be duplicated.
Note: Most of the real projects I work with are based on IntelliJ's IDEs (i.e. Idea & AndroidStudio)
