Adds a new section below your current content, with the boundaries of the section(s) indicated by dotted lines (the dotted lines aren't visible when you view the page).
Changes the column layout of the section in which you have your cursor. Content doesn't get lost when you change the column layout; additional columns are added to the right, and when you change to a layout with fewer columns, the content moves to the left.
Moves the section you have your cursor in, along with all the content in it, above or below other sections on the page.
Removes the section you had your cursor in, deleting that section and all of its contents