Success in photography is not either/or. Both technical and artistic/compositional skills are needed. This is no different than the other artistic endeavors of painting, drawing, pottery and ceramics, tissue-making, paper-making, woodwoorking, etc. If you haven't mastered your tools and your materials, you cannot truly call yourself an artist in that discipline.
To the OP, to WOW your wife, you need to do the basics well. The technical stuff is described in the tutorial thread
http://www.thephotoforum.com/forum/photography-beginners-forum/123160-tutorial-thread.html. If you manage to get most of what is in that thread, you'll be ahead of most beginners, and even the intermediate photographers. But there is also the issue of learning to "see" which is not trivial, as you have to unlearn many visual habits and shortcuts that we all have. And finally, there is the little matter of anticipation and preparation - once you know how to
make photographs of the things/subjects you
see, you also need to learn to read the light (or construct it), choose the decisive moment (or anticipate it), and once you've captured the image, process it to bring out the best of what that situation contained.
You'll also learn that the pro gear is not just an excuse for the camera manufacturers to make money. At a certain level of skill and ability, you will benefit from the things that expensive gear can give you in terms of dynamic range, low-light performance, resolution, and flexibility to handle almost any condition. But unfortunately, few of us are skilled enough to push our gear to the limit - most of the time the limits are our own skills.