Answer:
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?
I tell people to be careful when handling boxes.
Crooked as a rainbow and slick as a plate ten thousand horses can't pull me straight.
3 point goal
2 in a corner 1 in a room 0 in a house but 1 in a shelter.
Give it food and it will live, give it water and it will die.