I am a BRAND-NEW SharePoint user so I apologize for the lack of
knowledge shown by my question.

In a SharePoint library (probably version 3), what is the best way to
show within a folder that other documents exist in other folders
related to those in this folder? Is there a place where I can learn
about this?

An example to explain my question: If I had a SharePoint document
library for a zoo, I would have folders for each animal type. Someone
looking in the monkey folder, should be alerted to the fact that the
zoo management meeting notes folder has minutes from a meeting in
July, 2005 that concerned monkeys. I do not want multiple copies of
those meeting minutes dispersed throughout the library, they are all
stored in the meeting minutes folder, but someone looking through the
monkey folder should be alerted that meeting minutes exist of
importance to the topic of this folder.