Your site's Front Page welcomes the world to your learning site. Moodle treats your Front Page as a special course. This means that you can do everything on the Front Page that you can do in a normal course, plus a few additional settings.
Early in the process of building your site, you can make some decisions about how your Front Page will look and function. This section deals with those settings that make sense to select when you're first building your site. Some configuration settings on the Front Page won't make sense until you've created some courses, and seen how Moodle works. You will find those settings covered in the chapter on Welcoming Your Students.
If you have already created courses for your site, consider working your way through this section, and then working through the chapter, Welcoming Your Students. These two will give you a fairly complete process for configuring the Front Page of your site.