So you should be aware of those things as I said when you want to visit China as most of you know about China culture Leftover food is bad, Chinese people will eat their own meals until there's nothing left because that causes bad luck.
when you drink. You should hold your glass lower than people older you to show respect.
Other important things. You shouldn't write with red pen because that shows disrespect or it means protest and don't give clock or books as the gifts to someone because in Chinese Clock pronounced the same as funeral and the word book pronounced the same as fail. So you should be aware of those things.