Answer:
What is the heart of many risks, has a heart, but is not a living being?
I scribble forms of the finest letter, And repel elements of the harshest weather. I am an arrow-aimer and a dust-breaker.
Look into my face and I'm everybody. Scratch my back and I'm nobody.
This is needed both for courage and hardcover books.
A box without hinges, lock or key, yet golden treasure lies within.
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?