China is a country with a long history, so there are many customs in China
Firstly, you are supposed to shake hands when you meet someone for the first time. Secondly, when you eat dinner with other people, it’s rude to point at others with your chopsticks. Besides, if you are going to a party, you are supposed to arrive at the party on time, or a few minutes later. You can’t give a clock to your friends as a present, because it means “death” in Chinese.
“When in Rome, do as the Romans do.” If you come to china, please follow the rules.