In China, as with any culture, there are rules and customs on what is appropriate and what is not when dining in a restaurant or in someone's home. Learning the appropriate way to act and what to say will not only help you feel like a native, but also will make those around you more comfortable, and focus on you, instead of your interesting eating habits. Don't stab your chopsticks into your bowl of rice. Buddhists think, placing two chopsticks down in a bowl of rice is what happens at a funeral. Do not play with your chopsticks, or drum them on the table - this is rude. When setting down your chopsticks, place them horizontally on top of your plate, or place the ends on a chopstick rest.
