Comments and bookmarks enable you to annotate your text and create jump markers so that you can quickly access topics or chapters that you need to edit frequently.
Comments and bookmarks are separate. You cannot jump to comments and you cannot add text to bookmarks, other than the label that is the bookmark name. However, they can be associated with one another: You can set a configuration option that will automatically create a bookmark for every comment you enter.
Comments and bookmarks are only an editing tool to make working on your project easier. They are not normally exported when you publish your project. However, you can export comments to PDF.