There's a software I use on me Mac called Intensify Pro.
It's a bit like iPhoto or Aperture, but it feels more friendly for beginners. It lets you edit all the different measures on your photos or use some of their presets. The focus on the software is to increase the detail visible on the photos by fixing the shadows and highlights.
It works for a beginner like me, and it also works for professionals (it has a Photoshop and Lightroom and Aperture plugin).