What is one way to notify collaborators of changes to a Google document?

Inserting a comment and mentioning a collaborator's email address with a "+" is an effective way to notify collaborators of changes to a Google document. When you mention someone in a comment, they receive an email notification that includes the content of the comment and a link to the document. This direct notification helps keep everyone informed about revisions or discussions related to specific parts of the document in a timely manner.

Creating a new version of the document does not inherently notify collaborators unless they are specifically checking document history. Using the Insert > Link option creates hyperlinks within the document but does not provide any notifications to collaborators. Sharing the document again may alert collaborators, but it is less direct and effective compared to the targeted notification method of @mentioning in comments.