Have you ever inadvertently overwritten a file because you used the Save command instead of Save As? This simple tip helps to avoid that.
I see a common pattern in that an existing document (Word, PowerPoint, etc.) is opened, modified and then saved with a different file name. This is a high-risk workflow, in that using Save instead of Save As will cause the original document to be overwritten.
There is a feature in Windows Explorer/Office to open a file as if it was new. Right click on the file and chose New.
In the Office application, the contents are a copy of the original file, but the file name is the default (Presentation1, Document1).
Clicking Save will prompt for a file name. Your original document remains intact!