Answer:
You can build or destroy. Let creativity soar but be careful at night.
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
My second is performed by my first. A thief by the marks of my whole might be caught. What am I?
I am the book one can never finish reading
In buckles or lace I help set the pace. The farther you go the thinner I grow.
I go in hard come out soft. Blow me hard and I’ll make a pop.