German has both a formal and an informal/familiar for for you.
Sie is formal and is used to address strangers, business associates, and acquaintances, and for most situations outside the family.
Du is for family and relatives, close friends, young children, pets, and God. People in the same social group or class, such as students or factory workers, usually address each other as du.
It is true that there has been a trend towards less formality, but it is important for us to understand and abide by the cultural norms. It is better to start out too formal than to risk being too familiar.
Here is a great article on Deutsche Welle on the use of Du and Sie. http://www.dw.de/the-du-sie-dilemma-in-german/a-16494631
Here are a couple of videos to help you even more
https://www.youtube.com/watch?v=3RVjpuJzw74
https://www.youtube.com/watch?v=IwGnVwb-Gbo
Sie is formal and is used to address strangers, business associates, and acquaintances, and for most situations outside the family.
Du is for family and relatives, close friends, young children, pets, and God. People in the same social group or class, such as students or factory workers, usually address each other as du.
It is true that there has been a trend towards less formality, but it is important for us to understand and abide by the cultural norms. It is better to start out too formal than to risk being too familiar.
Here is a great article on Deutsche Welle on the use of Du and Sie. http://www.dw.de/the-du-sie-dilemma-in-german/a-16494631
Here are a couple of videos to help you even more
https://www.youtube.com/watch?v=3RVjpuJzw74
https://www.youtube.com/watch?v=IwGnVwb-Gbo