Answer:
I am heavy forward but backward I'm not.
*forward* *backwards*is what I do all day. I come in all different shapes and sizes. I can be scary and I can calm you down.
I have 4 wings but cannot fly. I never laugh and never cry. On the same spot I'm always found toiling away with little sound. What am I?
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. What am I?
I cannot be bought cannot be sold even if I’m sometimes made of gold.
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?