Follow the general etiquette
Some of the common etiquettes have been taught by parents when you were young. If you don't follow these common table manners then be prepared to get those weird judgmental looks from people. Some of the general etiquettes are: don't make the chewing sounds while eating, don't speak when your mouth is full, always cover your mouth while coughing and never place your elbows on the table.
Do not rush to eat
Always follow the lead of your host. Most of the times he/she has seating arrangements already set in their mind. Don't go and seat yourself in any chair you want to be seated in. After you sit, pull the chair gently and do not drag it over with the horrible scrape.
Place napkin on your lap
Unfold the napkin and place it on your lap while you are eating. Use it occasionally to wipe your hands and lips. Remember, don't create a scene by using it to blow your nose. Instead, excuse yourself to go to the washroom for it. Place it in the chair while excusing yourself. At the end of the meal, place the napkin on the left side of your plate.
Wait for food to cool
When the food is served hot, wait for it to cool. Don't blow on it. When you are served any kind of soup, do not tilt or even lift the bowl. You wouldn't be making a good impression. Ask politely if you want any dish to be passed to you. Generally, it is not a good thing to use your hands while eating food. But there are some exceptions to it as well. For example, it is always advised to tear your bread with the hand instead of a knife.
Resting utensils when you want to speak
When you pause in order to speak with someone, always place your knife and fork on your plate. Place it in an inverted V shape with their tips facing each other.
Wait for others to finish their meal
After finishing, wait for others to finish their meal. Place the napkin on the table. Place the knife and the fork pointing upwards on the plate. Don't leave either of them on the sides.