Here is a comprehensive tutorial for absolute beginners on ArcGIS Experience Builder Developer Edition 1.12.
https://daviddas2.github.io/exb/
This app is mobile friendly. It collapses gracefully to fit a Tablet or Smartphone in portrait and landscape mode.
No programming is necessary. The two custom widgets for Google Earth and Pictometry come preconfigured.
The first 3 parts of this Tutorial can be done using the ArcGIS Online Edition of the Experience Builder.
