One of the main things, that makes so great, is the possibility to choose the number of columns, you want to split each of the pages of your site. You can do that from Pages in the admin panel. Every page is divided by two parts: body and footer. The body is the main part, where you will insert your texts, images, videos, comments and so. The footer is usually used, for inserting another menus, contact details or a contact form. The best thing, is that you can change at any time, the number of the collumns in the body or the footer, without loosing your content.