Explore advanced concepts in differential geometry in this 53-minute lecture on more general surfaces. Delve into ruled surfaces, developable surfaces, and their classifications by Euler and Monge. Learn about mean and Gaussian curvatures, minimal surfaces, and Plateau's problem. Examine algebraic surfaces, including the ellipson, cubic surfaces, and Cayley's surface. Investigate projective constructions of surfaces and their applications. Gain insights into the historical development of surface theory and its connections to various mathematical disciplines.