1. Meeting people 与他人见面
Greet elders/high ranking people first.
As a man, do not shake hands with a woman, unless she offers it first.
Do not cover a woman's hand with two hands or grab it firmly.
Unlike in Europe or the US, a handshake should be light, not firm.
Stand up when people greet you.
Wait for elders/higher ups/hosts to sit before you do; wait until you are assigned a seat according to your position in the group.
When receiving a business card, accept it with both hands and do not immediately put it away – NEVER throw it away where people can see.
Looking into people's eyes for longer may be considered impolite/offensive.
2. Conversation 与他人对话
When receiving a compliment do not accept it with a plain "thank you", instead say something like "only so-so", "no, not so good", "only a little", to show moderation.
Do not brag.
Do praise others (especially in front of other people).
When you want to refuse (e.g. a requested favor), do not say "no" say that you will try, think about it, maybe do it etc. (if you hear these from a Chinese person, it basically means "no").
3. Table manners 餐桌礼仪
Wait for your hosts to assign you a seat.
Wait for the main host to start eating before you do.
Wait for a toast to be made to drink your beer.
When toasting, it is good manners to try and get your glass below the one of the higher/equal ranking person.
If you do not wish to drink alcohol, give a "good" reason in the beginning.
Do not stick your chopsticks in the rice bowl.
Do not finish a dish (this signals it was not enough food).
Do not take only of the one dish you like most.
If someone puts food on your plate, at least taste, better eat it all.
4. Presents 送礼
Avoid anything numbered "4" (symbolizes death, better are 2, 3, 6, 8).
No watches or clocks (death).
No pears to couples (breakup).
No green hats (infidelity).