The API Tutorial is a great way to get started with building apps for Office. The app will teach you how to get basic development tasks done in an interactive way by allowing you to run and edit code directly in Microsoft Excel!
The app contains six tutorials:
-Write and Read Text
-Write and Read Range
-Write and Read Table
-Update a Row in a Table
-Get Selected Coordinates
Bonus feature: The app allows online access to all tutorials using the “Napa” Office 365 Development Tools.