A section is just one part of your homepage. The base package comes with three. You will be able to navigate to any of these sections just by scrolling down the page. You’ll also be able to navigate to them by clicking on any of the navigation menu items as well. The beauty of sections is that everything is on one page, so there’s no need to load a new page, thus making your website load faster. Sections are really great for an overall showcase of those main areas of focus – things you really want your visitors to see more than anything else on the site.
A page is a separate location within your website (rather like another page in a book). Pages are great when there’s a lot more content for a particular topic of focus. Some use cases are for things like lists of documents visitors can view/download, or maybe you need to showcase your work in a portfolio. Pages are great for that.