When you create or edit a node, the page you see is a node edit form. A node edit form contains fields for your content - this guide is about fields commonly used across content types.
If the Sector Media Gallery add-on has been installed, you are able to add galleries of images and videos to your site. In this guide you can learn how to add and edit media galleries.
The Page content type is used for pages that are in your menu structure - you can easily move these pages around the menu (even changing their level) and there are plenty of display settings for you to customise how they look.