Table manners are very important in both professional and social situations, so it’s a good idea to know some basics.
If you have never been taught dining etiquette or you’ve forgotten what you learned, here are some tips to show that you know how to behave at the table. Displaying proper etiquette at the table will also help you socially and professionally or in someone’s home.
The 10 Do’s!

Once seated, unfold your napkin and use it for wiping your lips or fingers. At the end of dinner, leave the napkin tidily on the place setting.
It is the right dinner table etiquette to serve the lady sitting to the right of the host first, then the other ladies in a clockwise direction, and lastly the gentlemen.
Hold your knife and fork with the handles in the palm of the hand, your forefinger on top, and thumb underneath.
While eating, you may if you wish rest the knife and fork on either side of the plate whenever your mouth is full. When you have finished eating, place them side by side in the center of the plate.
If you don’t like the food presented to you, it is polite to at least make some attempt to eat a small amount of it. Or just cut it up a little, and move it around the plate!
It is good to leave some food to one side of your plate if you feel as though you have eaten enough. On the other hand, do not leave your plate so clean that it looks as if you haven’t eaten in days!
You can eat your dessert with both a spoon and fork, or alternatively a fork alone if it is a cake or pastry style sweet.
When a lady wishes to be excused for the bathroom, it is polite for the gentlemen to stand up as she leaves the table, sit down again, and then stand once more when she returns.
Do not forget to thank the host and hostess for their hospitality before leaving.
It is good dinner table etiquette to send a personal thank you note to the host and hostess shortly afterwards.

The 10 Don’ts!

Never start eating up your food before a signal from the host to do so.
Forks should not be turned over unless being used for eating peas, sweetcorn kernels, rice or other similar foods. In which case, it should be transferred to the right hand. However, at a casual buffet or barbecue, it is quite acceptable to eat with just a fork.
Using one’s bread for dipping into soups or mopping up sauces is generally not regarded as a good dinner etiquette.
Loud eating noises such as slurping and burping are very impolite. This is the number one sin of dinner table etiquette.
Talking with one’s mouth full is unpleasant to watch, and could also lead to choking!
Do not stretch across the table crossing other guests to reach food, wine or condiments. Simply ask a guest sitting close to pass the item you need to you.
Good dinner table etiquette sometimes involves a degree of diplomacy when it comes to the host’s choice of food and wine! Even when you feel that you can do better, never offer your criticism. If you can’t pay any compliments, at least remain silent on the subject.
Picking teeth (unless toothpicks are provided) and licking fingers are very unattractive. The only exception to the latter is when eating meat or poultry on the bone (such as chicken legs or ribs). In which case, a finger bowl should be provided.
Drinking too much wine can be very embarrassing! Where a different wine is served with each course, it is quite acceptable to not finish each glass.
Make polite conversations with those guests around you. Dinner parties are not just about the food, they are intended to be a sociable occasion. 

 
Simple Good Manners
Apart from the dinning etiquettes listed above, there simple good manners you should exhibit. These are:

Always respond to an invitation within a week of receiving it.
Dress according to the (if any) dress code. Do not try to “out dress” the hostess!
Be punctual – never more than 10 minutes late.
If you wish to bring a guest as your partner, make sure you check with the host first.
If you are the host of the party and a guest of yours arrives with an unexpected friend, be polite & courteous with them, and speak with your inconsiderate guest at another time.
It is considered polite to take along a cute small gift for your host and hostess. Flowers, chocolates or champagne are always appreciated.