The word "aunt" is a general salutation in mainland China. But people in different regions have different preferences when they sound this word. for example, in southern part, people prefer to call middle-aged women "ayi", which means aunt in general; while in northern part, they would like to call middle-aged women "yi" or "gugu". Meanwhile, people call young girls "jiejie", which means sister, or "meinv", which means beauty. When you begin to learn mandarin, it's always a good idea to have a tutor around you so that you can follow the tutor and get more language sense.