Answer:
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I’ve told you all I cannot tell you more.
I cannot be bought cannot be sold even if I’m sometimes made of gold.
Why is leather armor best for sneaking?
I can be hairy and itchy all over. I can be the scariest thing you have ever seen. I stand in the middle of nowhere, hanging on a stick. What am I?
I have roots nobody sees. I am taller than trees. Up up I go but I never grow.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.