This training aims to provide learners with a comprehensive understanding of DCAT-AP and its practical application in improving the findability and reusability of data within Data Spaces. The course is designed for individuals interested in Data Spaces, regardless of their prior knowledge of semantics or data cataloguing solutions. The course consists of five chapters that cover various aspects of DCAT-AP and its implementation.Throughout the course, learners will gain a clear understanding of how DCAT-AP can be leveraged to improve or build Data Spaces. The course aims to contribute to achieving data interoperability and driving innovation in the digital economy.