What does the original gospel of the Old Testament mean?

The dictionary explains: proto-evangelium: also known as the original gospel or meta-gospel: Genesis of the Old Testament: "I will make you and that woman enemies, and your descendants and that woman's descendants will also be enemies with each other. The offspring of women will hurt your head ... "(Gen. 3, 15) predicted that Christ would conquer death and save mankind. So it is called the original gospel. This explanation means that the original gospel is the first good news that God predicted redemption to mankind after human sin. For Jews, they didn't regard this Bible as the gospel to predict the Messiah. The godfather thought that this was the victory to predict the Messiah.