In Media section you can upload various files to your server. Suppose you want to put some advertisement on your website. So ad image must be uploaded. In such cases this module will be useful since you don’t have to upload using FTP.
Almost every website needs to have one About Us page. Some sites need more such independent pages. With “Pages” module you can create such independent pages.
You can include your pages on sitemap from “Pages” >> “Sitemap”