Be Wary of Handshakes
It's customary in most cultures to greet someone with a handshake. It's the smallest form of respect you can show! In China, handshakes aren't really accepted nor are they appreciated. If you do give a handshake, make sure it's light. No hard grips!
No Bitcoin
This one isn't really a head-scratcher - China has banned cryptocurrencies such as Bitcoin. In 2018, they blocked all websites dealing with crypto. In 2021, they intensified the rules by making all crypto activities illegal.