Customer pages, navbar to footer: a page header, then the proof, a wall of testimonials, one story in the spotlight or the sites teams shipped, closed by a call to action. Three finished pages.
A section is one full-width band: a hero, a pricing table, a footer. A page stacks several of them into a finished screen, from the navbar to the footer. The sections are the parts, the page is one tested way to put them together.
Koala UI