Just a heads up if you use goo.gl URL shortener, Google will be shutting down this service as of April 13th. If you already have shortened links you will have continued access for one year. Details can be found here. Your previous URLs will continue to redirect to the intended destination.
Check out Bitly as an alternative URL shortener. Both Bitly and tinyurl.com allow you to customize your link - making it much easier for your students or participants to remember.
