There are many Format options in the drop-down menu. The most common are Weekly format and Topics format.
Weekly format organizes the course week by week, with a clear start date and a finish date. Moodle will create a section for each week of your course. Make sure your course start date is correct (above).
Topics format organizes the course into topic sections that an instructor can give titles to. Each topic section consists of activities, resources and labels. This is great to use if your course is objective based and each objective may take different amounts of time to complete.
The Number of sections drop-down menu is only used by the Weekly and Topics course formats. In the Weekly format , the number specifies the total weeks that the course will run. In the Topics format, the number specifies how many topics are in the course. Both of these translate to the number of sections on the course page.
The Hidden sections allows you to decide how the hidden sections in your course are displayed to students. They can be completely invisible, or shown as collapsed sections which indicate where the hidden material will become available.
The Course layout determines whether the whole course is displayed on one page or split over several pages. If Show one section per page is selected, the course page is abbreviated to a list of links to individual sections.