What does "hen" mean?

This is a witty transliteration of "I don't know" in Cantonese (meaning "I don't know") translated into Mandarin, for example, "I don't know" translated into "my mother chickens and ducks", which is a bit funny.

How to learn Cantonese from scratch?

(1) There is a good online program called Crazy Cantonese. Hosted by Cantonese speaker Mr. Guo Jiafeng, he is also the host of Guangdong Radio and Television Variety Channel and the face of Guangdong Satellite TV after 90. You can watch BiLi and Youku.

(2) You can also watch more TV dramas of TVB. TVB actors have good dialogue skills and authentic pronunciation. If you have friends in Guangzhou or Foshan, you can also ask them to teach you Cantonese. The reason why Foshan is chosen instead of other cities is that the pronunciation and usage habits of Cantonese in Foshan are generally close to those in Guangzhou, and the accents in other areas are quite heavy, which is quite different from Cantonese. If you want to listen to Cantonese, you should listen to Samuel Hui, George Lam and other early Cantonese songs, because their Cantonese songs are not as diverse as the current singers, and they are relatively plain and rarely tone-shifted. In particular, as the pioneer of Cantonese pop music, he is called "the song of saliva", and his lyrics are not as literary as those of Lin and Lin. They are simple and easy to listen to and understand.