Primary and Secondary Sources Comparison

The difference between Primary and Secondary source is that Primary source is told from a person who was in or witness the event. Secondary sources is sometimes good but in my opinion is useless. I say this because it is told by someone who heard about the event or read about it in a newspaper. It might not always be true is what I'm stressing. If the story was not told by the people who were in it or watching it, it should not be talked about. So the difference between the two is that Primary is more reliable then Secondary.