Wortnetzwerk: entree

A series of lessons or lectures on a specific subject, typically leading to a qualification. It can also refer to a specific direction or path that someone or something follows, or one part of a multi-part meal.

An appetizer is a small portion of food or a drink served before a meal to stimulate the appetite. It is usually savory and intended to prepare the palate for the main courses to follow.

Principal; most important; chief.