This is the public side ("frontend") of your application.
Everything related to it is contained inside
You can treat this directory as a
/protected subdirectory equivalent.
Frontend is crystal clear HTML5 Boilerplate.
It's expected that you are going to write your own 100% custom design anyway.
Points of interest:
/backend/components/FrontendController.php is the base for all frontend controllers.
It registers all required styles and scripts for common frontend UI.
Note that in this layout there is the Google Analytics code already inserted as a widget.
Just provide your GA ID in the
['params']['google.analytics.id'] section of a config,
by specifying it in the
/frontend/config/environments/prod.php, for example.