Lighting is the task of illuminating your subject in a manner that is both aesthetically pleasing and illustrative. With light, you are “painting” your subject in photons, enhancing or hiding apsects of the subject in order to tell a story. Lighting leads the eye, creates mood, satisfies curiosity or maintains an aura of mystery. How you use lighting is up to you, but learning about lighting techniques will guarantee your ability to tell visual stories and satisfy your creative urge.
Lighting is Cinema 4D is similar to lighting for photography or cinema; some tools are similar, some are different. Of course, the physical contraints are gone from a content application like Cinema 4D, which is both good and bad. The good is the versatility, and the freedom from physical bonds that would otherwise be impossible in the real world. The bad is effectively the same; limitations inspire creativity, and a lack of limitation can lead to blandness. Life is too short to be bland.