For MS Word files (.doc and .docx) I use the Track Changes and the Comments features. You can find the Track Changes and Comments tools under the
Review tab at the top of your menu. Use the tools there to Accept or Reject changes one by one, or all at one time.
Individual changes can be accessed by right-clicking on them. Right-clicking on a comment balloon also brings up a dialogue window with various options for you to reply to the comment, delete it, or mark it as done.
Different versions of Microsoft Office may access these functions differently. Please refer to your specific version for help on how to review and track changes made to the document.