You will get every page that your website has in the content folder. The content folder is a subfolder of the project folder.
For maintaining it from forestry, you can find all the page content at the top of the left sidebar.
Other Pages
There are two types of pages in the Hugo theme, list page, and single page. The list page is kind of a landing page (ex: about page). And the single page is called the inner page of a product or a post (ex: blog single page). We need to define the structure or markup of every page.