I recently came across this image of Google Drive. The Anatomy of Google Drive by ShakeUpLearning.com highlights many of the key features of Google Drive.
More interesting tips:
Documents can be in more than one folder (press command as you check the box to the left of each document then select the folder from the top tool bar. A list of your folders will be generated. Choose which folder or folders you would like to put the document in.)
Comments: When collaborating on a shared document, if you type a + before the email address of the recipient in your comment (+email@example.com), your message will immediately be sent to the recipient via email. (Thanks for the great tip Judy!)
As always, please let me know if you have any questions!