The simple answer is - it's where the previous developer put it
You are not restricted with Evo or Revo to where you place your files. If your predecessor used the default set-up, you may find your files on your server in the "assets" folder, possibly split down into the following folders: "images/", "templates/", "media/", "files/". But again, that isn't neccessarily fact
The templates (HTML structure) will (in most cases) be in the DB - In Evo you can find them in the control / admin panel under: Elements => Manage Elements => Templates Tab
Note: templates in Evo & Revo have nothing in common with WordPress themes, they are completely different - you need to read the documentation
I personaly think you should have a play before you start working on a live site and take a look at the
documentation - you will find a lot there
[ed. note: iusemodx last edited this post 7 years, 5 months ago.]