The Goryeo-Khitan Wars were like big battles between two groups of people. The Goryeo people were living in a place called Korea, and the Khitan people were living in a place called China. They were fighting because they both wanted control over some land in the middle.
This fighting happened a long time ago, when I was not even born yet. It started in the year one thousand, and went on for many years. The Goryeo people were worried that the Khitan people would take over their land, and the Khitan people were worried that the Goryeo people would take over their land.
The battles were very violent and lots of people got hurt or even died. The two groups were using weapons like swords and bows to fight each other. It was not a very nice time for the people living in the area.
In the end, after many years of fighting, the Goryeo people were able to win the wars. They were able to keep control of the land and the Khitan people had to go back to their own land. This made the Goryeo people very happy, and they were able to live in peace after that.