Safety and security are the two biggest benefits of outdoor lighting. Consider safety first and foremost. A well lit outdoor area lacks shadows on paths, steps, and other areas where people could trip or potentially hurt themselves. No one (guest or thief) will want to come over if they have to navigate a light/dark obstacle course to get to your front door.
Consider lighting from the ground up or from the sides out. Be careful with lighting from above. Remember: the goal is to reduce the amount of shadows and darkness. This won’t prevent clumsiness, but having less darkness equals more safety.