Given what is known about the tombs of the pharaohs, what does an ancient Egyptian's tomb tell us about?

It tells us how the person died, what they considered treasure, about their religion and stories due to the Hieroglyphics written on the walls of tombs that Jean-Francois Champollion found out how to decipher. Due to him we can read and understand Hieroglyphics, which tell us information about what it was like back then, and stories and religion, which are usually written on the walls of tombs.