It's important as photographers that we show our best work. Let's use the various tools available to us for straightening crooked horizons, cropping out unwanted and/or distracting subjects, sharpening, adjusting white balance, and giving our photographs some "pop."
I've watched excellent tutorials by professional photographers around the world who share their editing secrets. We don't have to run out and buy PhotoShop or Lightroom though... there are many free programs and smartphone apps that will do the job!