Removing metadata is important. It used to be easy. But now Microsoft has hidden this feature, and requires the user to take action with each document – rather than making one choice that applies to all documents.
On a Mac, in your Word document, go to Tools from the top bar, and select “Protect Document.” In the dialog box that opens, scroll to the bottom and click the box for “Remove personal information from this file on save.” Click “OK” at the bottom.