The 2nd Crusade many of the Crusader's ships sank before ever reaching.
The 3rd Crusade the three kings began to argue amongst themselves with the kings of France and the Holy Roman Empire returning home.
The 4th Crusade made an agreement with the leader of Venice, the Doge, to pay them for ships to the Holy Land.
Crusaders learned about new products from the East such as exotic fruits, silks, cotton, and spices. They also gain knowledge about mathematics, medicine, gunpowder, architecture, and astronomy from Muslims.
Kings gained power because they were able to take over the lands of lords and knights who had died on crusade.
Christians, Jews, and Muslims hostile feelings were created during the Crusades which have lasted into the present day.