In Assassin's Creed Valhalla you can find cairns that will give you extra points. On this page of our game guide you will learn where to find cairns locations in the Ledecestrescire region.
You will find the cairn to the north of Ledecestre, right next to the river.
It is a very simple task. Arrange the stones so that the entire structure breaks through the blue marking. On the screen above we showed the most optimal construction, nothing should happen to it.
This will give you an extra skill point.