We still use their Sexagesimal (Base-60) system today. It’s the reason there are 60 seconds in a minute and 360 degrees in a circle.
Perhaps their greatest gift was Cuneiform . Originally used for mundane tasks like tracking grain and sheep, this wedge-shaped script evolved into a tool for literature, law, and history—most notably seen in the Epic of Gilgamesh . Sumerians.v0.4.5.5.rar
However, if you're looking for a comprehensive summary or "complete piece" on the to fill in the blanks of your project, here is a concise breakdown of their legacy: The Sumerians: Humanity’s First Civilization We still use their Sexagesimal (Base-60) system today