1) Have the address of your hotel/destination printed out in Chinese, it’s also best if you have a common phrases handbook to help you get by.
2) If you haven’t sorted a VPN app on you’re phone prior to arrival then get used to using BING. That is the only English search engine you can access on local WiFi.
When you get a Chinese page on your browser after connecting, type BING in the search box, and then you’ll be able to look for things in your own language English or otherwise.
3) Resist paying anyone standing outside an attraction to be your guide, it might seem like the easy option but you can pick up an audio guide for all major tourist attractions and go at your own pace for a fraction of the price.
4) Don’t carry your passport out and about, I think that applies to any country, to be honest. You’ll be asked frequently for a passport when accessing tourist attractions but you can use your driving license any other form of photo ID.
5) You will lose your personal space! Get used to it!
6) Carry extra hygiene items with you at all times, hand sanitizer, toilet paper, gloves, waste bags, etc.