Survival skills tend to revolve around finding three main things- food, water and shelter.
When you need the energy to build a shelter or haul a supply of water up from the river then food becomes more important than the rest, and nothing helped primitive people catch food like the bow and arrow.
Nowadays we take the bowyer's and fletcher's skills for granted, unaware of how hard it is to make a bow and arrows without the aid of modern tools until we see a demonstration of the entire process.
Primitive Technology has some serious skills so he makes the process look pretty easy, and he provided a full description of the materials used, and how he used said materials, in the video's description.
-Via Sploid