Which player holds the NFL record for most career rushing yards?

What is the term for a quarterback running the ball himself on a short-yardage push? What is a "flea flicker"? What is it called when the ball carrier loses possession of the ball? Which player holds the NFL record for most career passing yards? Which player holds the NFL record for most career receiving yards? Which player holds the NFL record for most career touchdowns? Which running back set the NFL single-season rushing record with 2,105 yards in 1984? Which quarterback set the single-season records with 5,477 passing yards and 55 touchdown passes in 2013?