Time for action – journey to the Unity Script Reference
The Unity Script Reference is like a dictionary that contains every single word of Unity JavaScript we'll ever need. It's organized extremely well, is searchable, and has hyperlinks to related sections. Look that up in your Funk and Wagnalls.
Make sure that the Ball is still selected.
Find the Mesh Renderer component of the Ball in the Inspector panel.
Click on the blue book icon with the question mark on it to open the manual.
Your default browser should open, and the Mesh Renderer page of the Unity manual will load. Note that you're not viewing this information online. These are HTML files stored locally on your computer that Unity displays in your browser. You can find this same Unity manual online at the following URL: http://unity3d.com/support/documentation/Manual/index.html
The manual tells you how to work with the things that you see in the Unity interface. The page you're looking at now tells you everything you always wanted to...