Which do I chose? Link to Activity or Copy Activity?
When accessing material from the Digital Library, you have a choice to Link to Activity or Copy Activity. You will almost always want to chose Copy Activity.
Copy Activity: Does just what it says copies the activity into your course to edit as you see fit.
Link to Activity: The content will appear in your course, BUT you can't change it and any changes made in the original will also appear in your course with no notification to you. Think about as you would linking to a newspaper article or website, the links can "break" or the content can change.