The Spaniard joined the Red Devils from Atletico Madrid in the summer of 2011 and after a difficult first season in the Premier League, has now established himself as one of the best keepers in Europe.
"It's more about all the things you learn rather than one individual thing," he told United's official website. "It's an ongoing process as well, especially when you come to a club from another country.
"The whole thing is a great experience. At first, everything is new. The football, the culture and how people live... it's about learning how things work at the club and getting to know your teammates. The whole package has been a lesson for me."
De Gea helped United win the Premier League title last season.