This lecture covers the fundamentals of radiative heat transfer, including radiative properties of surfaces, exchange between surfaces, Monte Carlo methods, radiative transfer in participating media, and exact solutions. It also explores the radiative properties of gases and particulate media, as well as the basics of conduction and convection heat transfer. The lecture delves into the theoretical models behind radiative heat transfer, such as electromagnetic radiation and the concept of photons, while also discussing the laws governing thermal radiation and the behavior of blackbody radiation.