The waterfall at the top of the village has a cave underneath the water but it is blocked by some blocks. I can’t break it down with attacks. How do you break this wall to get inside. I can see stuff behind there when I use odins vision.
These types of walls can only be destroyed using explosions. This is common enough. You should find a red jar nearby with a small flame at the top. If you turn around there should be a stables or some hut and there will be an explosive jar here if you have upgraded the building.
Take the jar and throw it at the wall under the waterfall. It will explode and destroy the barrier.