For a true formal dinner setting, you should have enough matching placemats for all of the guests, and the placemats should also match the tablecloth.
You can also fold your napkin to the left of the forks after you put them down.
If you forget where each fork should go, just think of the order in which you would eat your meals. You would have your salad before your dinner, and you should eat from the outside in, using the utensils from left to right, so the salad fork would go to the left of the dinner fork. Remember that you should be eating with the utensils from the outside in, starting with the ones on the outside of the plate and working your way closer to the plate until the end of the meal.
If you mix up where the forks and knife should go, just think of how a right-handed person would use a fork and knife to cut something. If you sit down and mimic the gesture, you’ll see that you would pick up the fork with your left hand and the knife with your right, so that’s where each utensil should go.
Note that in some traditional settings, the soup spoon is actually larger than the teaspoon.
A bread and butter plate and knife. Place this small round plate about five inches above the forks. Place a small knife horizontally over the plate, with the blade facing to the left. A dessert fork and spoon. Place the small dessert fork and spoon horizontally a few inches above the plate, with the spoon on top of the fork facing left, and the fork facing right. A coffee cup. Place the coffee cup over a small saucer a few inches above the outermost utensil on the left and a few inches to the left of it. A red and white wine glass. If you have two different glasses, then the white wine glass will be the one closer to the guest, and the red wine glass will be slightly above and to the left of the white wine glass. You can remember this because guests should move from white to red wine.