I am planning to go to China, any tips?

China is a big country. Where exactly are you going? What time of year are you going? The big sights in Beijing- the Forbidden City, the Summer Palace, the Great Wall- are worth seeing. most of the rest of Beijing is a very modern city- very little left of old China. It's true that outside the tourist hotels, many people don't speak English. Look for the kids- they all study English in school. We would find a kid, tell them where we wanted to go, and they would write in it Chinese (Putonghua in Beijing, Cantonese in Shenzhen) on a piece of paper that we could show the taxi driver.

Don't disagree with anyone. They value harmony, not your opinion.

you should learn 'hanzi' 汉字。Also，speak mandarin

Don't expect many people to speak English. Be prepared to be charged a different price than locals/people who are fluent in the local language. 'Antiques' are sometimes modern and mass produced (not a problem if you like the item anyway).