http://cg.tutsplus.com/tutorials/maxon-cinema-4d/3d_cg_vfx_c4d_cinema4d_lighting_rendering_global_illumination_gi/

Global Illumination can be a little confusing at first, but really helps in creating realistic, nice looking scenes. This Cinema4D tutorial by Cgtuts+ regular Konstantin Muromtsev will help you better understand Global Illumination by discussing various lighting techniques, as well as explaining some of the render settings needed to achieve a good result.