Jesus was teaching from a boat.  He told the fishermen to put their nets in the water to catch some fish.  They didn’t think they would catch any fish, but they were wrong.   Their nets were so full of fish that the nets were breaking.  It was a miracle.  There were so many fish that they had to call their friends to help them.  After that, James, John and Peter followed Jesus Christ.  Jesus said they would become fishers of men.