The Site Editor is where you can make changes to the template you have selected. From here, you can add text, upload new images, replace existing images, add elements, change colors, add pages…including adding CSS if you have the know how.
When working within the Site Editor, you will see the Site Editor Menu on the left hand side. Within the Editor, you can add pages, change settings and add elements.
Also, if you hover your mouse over any element while editing your site, you will see icons that allow you to make particular edits.
Now that you have an overview of what the Site Editor is, let's start by reviewing the the Site Editor menu.