Microsoft Word has some nice shortcuts that are not well known. One of those is the Shift + F5 shortcut.
Use this to cycle between your most recent edits. With a large document, Shift+F5 is handy to see what you have edited most recently. And, you can use it when you first open a document to take you to your most recent edit.
If you are on a laptop, you may need to use your function key along with the F5 key.
Shift + Fn + F5