Answer:
I have a small hill with seven holes.
I go through a door but never go in and never come out.
I am easy to see, but no one likes looking at me. Without me, there would be no you. What am I?
I have to be broken before I can be used
Some will use me, others not. Some have remembered, others forgot. For profit or gain, I'm used expertly. I can't be picked off the ground or tossed into the sea. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.