Okay kiddo, so the Fetha Negest is a book that talks about the laws and rules that people who lived in Ethiopia were meant to follow a long time ago. It was written in a very old language called Ge'ez, which some people in Ethiopia still use today to pray.
The name "Fetha Negest" means "Law of Kings" in Ge'ez because it talks a lot about how the kings of Ethiopia were meant to behave and what they were allowed to do. It was written by some very smart people who knew a lot about the Bible and other important books.
The book is also important because it talks about how people were meant to live peacefully together and treat each other with respect. It says that people should listen to their elders and the leaders of their communities so that everyone can live happily together.
So even though the Fetha Negest was written a long time ago, it still has some really good ideas that we can all learn from today.