A starter is a small quantity of food served as the first course of a meal.
Recipes are here
A main is usually the biggest dish on a menu. The main ingredient is often meat or fish. It most often follows an appetizer, soup, or salad, and is often followed by a dessert.
Recipes are here
A side is an extra dish of food, for example vegetables or salad, that is served with the main dish, sometimes on a separate plate.
Recipes are here