How did the Crusades have an affect on Europe in the middle ages?

Crusades had an affect in Europe by not going on, so called "quest's" and they are like knights and vassal's asking Church officials or Kings in exchange for land, food, and protection to live and survive unfairly. Alexis Nieves P.S. - I think this is what Crusades have an affect on Europe in the Middle Ages. Because i watched about six videos on YouTube to get this answer, so maybe go on YouTube or google and press video and type the Word "Crusades".