If you want to hit the ground running with a topnotch photo app, look no further. I am an amateur who's tried 7 or 8 others. They are all good, but this is the best, short of those I suppose full-time professionals would need to interface with movies and slick magazines and such as that. It operates on Mac, Windows, etc., and smoothly interfaces with the Photo libraries of those systems. The owner can use it on five devices. I use it on MacBook, iPad, and iPhone.
I can't think of a way they could have made this a more user-friendly app. Every feature has a little window that pops up as a reminder of how to work it. If that isn't enough, one click links to a training video that clearly demonstrates how to use that feature, along with some handy tips.