Search: Google is blocked in China. Use www.baidu.com to search. Baidu is good to search Chinese, but not so good for English.
Map: Google map doesn't work either. Use Gaode.com website or APP. It can show traffic, driving route, and public transportation.
Passport: Consider to have your passport with you, especially in Beijing. Have to show passport to purchase ticket to visit Forbidden City. Some museums in China are free, but you need to use passport to get ticket.
High-speed Train: The high-speed train of China is marvelous.
Ctrip is a good APP to book hotels, flight, and train
Didi is an APP to get taxi. I was told Uber can also be used in China, but I never tried
Steemit: Though it's slow to load images, I have no other issues to access steemit in China. Upload photos to steemit is fast, so I have no problem to post steemit in China. However, got problem to register new steemit account, because captcha cannot be displayed. I guess the captcha used google, which is blocked by the great fire wall.