"Domain-driven Design" (DDD) is a concept introduced by Eric Evans 20 years ago. Today, DDD has become a complex collection of various approaches and techniques. In this complexity, the essence of DDD can easily be lost. Projects may appear to implement DDD, but they are not successful despite incorporating a multitude of DDD techniques because crucial aspects are overlooked. This presentation demonstrates how to focus on the core of DDD and truly achieve success in its implementation. Only a few specific approaches are actually necessary for this.