In America the traffic laws are too strict. In America the biggest cars are the safest cars. The second sentence is a fact, or a certainty. Other people believe that the size of the car does not make it safe. They believe that the way a car is made and what it is made out of make it safe to drive, no matter how big or small it is.
Opinion is the same as belief.
I m sure you know that people do not always have the same belief, or opinion , but reasonable people all know that a fact is a certainty . Try to answer these questions. Always a certainty 2. The same as an opinion. Always a belief.