This script is intended as an introduction to the fundamentals of the General Part of the Law of Obligations. It covers topics that are typically addressed in introductory lectures, such as how a debt relationship arises and what circumstances may hinder the establishment of such relationships. Special attention is given to the extinction of debt relationships. Additionally, important and highly relevant performance disruptions and their legal consequences are explained. The script also addresses tort law and assignment. The name niederle media represents scripts that are largely authored by individuals with several years of teaching experience as university lecturers or group leaders, presenting exam-relevant topics in a compact manner that can typically be worked through in 1-2 days, thus saving time.