This is a content box. A content box is where you can add content, and this content can be padded or aligned, width reduced, and you can even add background image. To access those options, please first click here, then click the "change section settings" button bottom right.
A content box is also place to add snippet blocks. Click in this section of text to add new snippets using the green "Add snippet block" button below, or use orange X red icon to remove snippets. A snippet is like a row.
This side is another content box, but 2 boxes side by side is a section.
This section does not include the sliding banners above, that is a another section.