Explore the fourth class of the mini-course on Fano manifolds and the Lefschetz defect, presented by Cinzia Casagrande from Torino, Italy, as part of the V Latin American School of Algebraic Geometry (V ELGA). Delve into advanced topics in algebraic geometry during this 1 hour and 26 minutes lecture, which is part of a comprehensive CIMPA School held in Cabo Frio, RJ in August 2024. Gain insights into one of the most active areas of research in algebraic geometry, alongside other mini-courses and panoramic talks by renowned mathematicians from around the world. Benefit from the opportunity to interact with researchers and students, and contribute to building a network of collaborations in the field of mathematics.