The reason manners is given so much importance, is because it teaches kids to be mindful of those around them. It helps them shift their focus from their own wants and desires, to those around them. Manners in a way, helps children blossom into better adults.
Good manners cannot be inculcated overnight, but develops with time. It's a lifelong process beginning at infancy. From the simple manner of sharing toys, children learn to become caring husbands or wives. They also learn to become compassionate friends. Thus, basic manners is not something that pertains to the elite class, but is meant for all!
✔ Use a fork while eating.
✔ Say 'excuse me' if you have to leave the dinner table.
✔ Take food portions that you can finish.
✔ Thank the person who prepared the meal.
✘ Speaking with your mouth full.
✘ Playing with your food/cutlery.
✘ Expressing dislike about the food served.
✘ Slouching over the table while dining.
✘ Leaning over the table for a dish.
✘ Picking food out of your teeth at the dinner table.