Here is a general info about China.
1. Languages: In China, Mandarin is official language, it's a language based on Beijing dialect. All the kids are taught in schools in Mandarin. But different cities different towns, they keep their own accents. So don't be surprised if you see a north people don't understand each other as their words, accents are very different. But a south people would understand north people very well, as their dialects are quite similar with Mandarin.
2. Cuisine: China has many different types of food, in general, there are 8 big types named: Sichuan cuisine, Shandong cuisine, Jiangsu cuisine, Zhejiang cuisine, Guangdong cuisine, Hunan cuisine, Fujian cuisine, Anhui cuisine. Sichuan cuisine represents spicy food and Zhejiang cuisine represents more light and sweet food. Of course, they differ a lot, if you want to know their real tast, you have to try in China, as Chinese dishes in foreign countries are not same like Chinese ones.
3. High tech development: In China now high tech develops really fast. Almost every young people owns a laptop and a smartphone. Many of them like Apple products even though they are expensive, one iphone costs about 5000¥, and a basic imac costs about 9000¥.
In western countries, you use what'sapp, while we use Wechat, which combines not only chatting, but also getting a taxi and pay online, etc.