Answer:
I have a ring but no fingers. I used to stay still all the time but nowadays I follow you around.
People need me yet they give me away every day.
2 in a corner 1 in a room 0 in a house but 1 in a shelter.
I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?
I am bought by the yard but worn by the foot
I flow from the Homerβs mouth when he sees doughnuts.