Who can teach me "authentic" Cantonese?

I'll teach you a way. Don't watch TVB and don't teach in Cantonese. None of this is useful. The best way is to listen to the radio every day, such as commercial radio and Radio Television Hong Kong. The second is to read gossip magazines every day, that is, in Cantonese, not serious newspapers or weekly magazines, such as Ming Pao.

The benefits of these two:

Broadcast: You can learn very authentic Hong Kong dialect (not Guangzhou dialect) because Hong Kong dialect has many lazy sounds. You can't learn a pure Hong Kong accent by listening to mainland broadcasts (such as those in Shenzhen and Guangzhou). Can only listen to Hong Kong radio. Why can't you learn well by watching TVB or TV? Because TV focuses on vision, not hearing, your attention will be focused on the image, not on pronunciation and thinking about its literal meaning, but broadcasting is different because there is no video. In order to understand the content of the broadcast (most of the programs are funny, even the advertisements are interesting, which is much richer than the mainland programs), you will use your imagination and judgment to scrutinize every word and sentence, so as to understand the meaning and usage of Hong Kong dialect. Radio programs are very diverse, similar to TV programs, including star interviews, hot topics, forums, lifestyles, radio dramas, quiz games, singing, news and weather forecasts, psychological hotlines (to solve the psychological problems of the people in the capital), etc ... Most programs are broadcast 24 hours, and you can listen to them at any time.

Gossip magazine: The purpose is not to make you a very "eight" person, but to let you know more about the expressions and proverbs of Hong Kong people, so that you don't have to learn how to write, because they are all vulgar words. Watching this can also increase your understanding of Hong Kong, such as what happened recently? What topic will we talk about after dinner? You can also learn some new popular words in Hong Kong. Maybe I didn't understand it at first, because English and common sayings came together. You can ask what Hong Kong people mean. If you know some common words, it will be much easier to speak Hong Kong dialect.

In addition, I also suggest that you communicate with Hong Kong people more, because it takes more practice to understand. You can go to dinner, play ball, karaoke, barbecue, shopping and volunteer with friends and colleagues ... to increase communication opportunities, so that you won't stutter at ordinary times. Most people in Hong Kong are friendly and helpful. As long as you study hard and are not afraid of making a fool of yourself, you will be taught to speak Cantonese.