In Divi, three basic elements make up most pages. They are: Sections, Rows and Modules. Sections contain Rows, and Rows contain Modules. Sections are blue (sometimes purple or red), Rows are green and Modules are Grey.
To create a new section, hover over an existing section and click the plus sign icon. A section also has it’s own set of options you can access by hovering and clicking on the cog icon. Here you’ll be able to customise things like background, colours, animation and spacing.
Need Further Tutorials?
Divi Builder overiew: https://www.elegantthemes.com/documentation/divi/visual-builder/