The textbook covers the General Part of Civil Law, which forms the foundation for practically all other areas of civil law. In particular, the general theory of legal transactions must also be mastered in the fields of obligations, property, family, and inheritance law. It is therefore an indispensable component of any legal education. Those who neglect this area will also struggle in other fields of civil law. Experience shows that the General Part of the BGB is a subject of study in the early semesters of law school. The unfamiliarity of students with laws and their formulations, as well as uncertainties in structuring legal opinions, coincide with a high level of abstraction of the relevant norms. Providing students with a comprehensible guide in this area is the aim of the textbook. It is tailored to the needs of both beginners and advanced learners.