This document summarizes the key points from the second class on Civil Law 1 taught by Professor Fabrício Carlos Zanin on September 23, 2021 in Tocantinópolis. The class covered: an introduction and review of the course; an overview of the professor, students, and subject matter; a discussion of sources of law like the LINDB and legal systems; important concepts of law including validity, continuity, and revocation; obligations and errors of law; methods of legal interpretation like analogy and customs; and principles of equity and legal application over time and space. The class concluded with a review and assignment of reflection questions for students to complete.