Maybe you want to create a shared document with students but keep some of the information private or hidden(such as answers to questions).
Now you can keep this text hidden by using a simple Add-On called Docsecrets!
Find out all about this very useful add-on and let me know how you would use it in your class.
Find the official website for this add-on here: http://www.docsecrets.net/
Find the add-on here: https://chrome.google.com/webstore/detail/docsecrets/gknbahfoppmfeahlhhgagbcbaacmhbnp