Guestbooks are features that allows visitors on a website to leave messages, feedback and comments. They are not the same as comments on blog posts, which are specific to that post. Guestbook messages are generally not related to a particular content but are directed to the owner.
Watch this short tutorial video:
The simplicity here is that just as we comment on posts and pages, the same is used for guestbook. After all comment from readers is all we intend to capture, right?
Want to create better Guestbooks? Explore these Guestbook related plugins on WordPress here.