What is difference between copy email, resending email and using QuickSend?

There are some fundamental differences between copying an email, resending an email, and resending an email through QuickSend. See below: You will Copy an email to make content changes to the message (such as dates, offer information, corrections, etc.) so that you can send it to a new list or to the same list again. You will Resend an email (as is, with no edits capable of being made) to