What is the difference between opinion and bias?

The difference between opinion and bias is that an opinion is what someone thinks about a certain topic when a bias is how someone thinks feels and reacts about a topic based on something from their past......for example I hate the color purple because my biological father likes purple. That is a bias when "the Phillies are the best team in the world is an opinion because there is nothing from my past that can back that up.

that's mean, my teacher said that they are all the same thing L.O.L (laugh out loud) lol ajdfl;ajskdlf