There are three key types of Knowledge that Natives can gain:
Repel lava and fireEdit
Again, this does precisely what it says. This is a very useful way of making sure that villages do not burn. When lava approaches a village, it is repelled in the same way water is, but if it is not dealt with, it is possible the village will become surrounded by rock. Fire, on the other hand, is simply put out when it reaches the radius of the village, therefore preventing it from burning.