At the core of everything for Confluence, is the page - as this is where all content is stored.
At the top of the page is the title, followed by the author information and the page content.
You can also see the menu options which allow you to edit the page, add content, and so on.
Each page can have labels (tags) associated with it.
Depending upon permissions, Confluence users can add comments to a page.
The default editor is a WYSIWYG. You can switch to "Wiki Markup" if you want to insert code directly and you can click on "Preview" to see what you page will look like when published.