I constantly try to think about this tip in all its guises to make my photos better. Sometimes I forget, so here's a video explaining the errors I've made both with my camera and in Lightroom and Photoshop. Also I'm truly sorry about the wall...
0:00 Intro
0:33 Greed
4:36 Tunnel Vision
6:25 Squashing the histogram
8:56 Global solutions
10:55 The real spectrum