There is no bad light. There is spectacular light and difficult light. It's up to you to use the light you have.
As people, we love pattern. But interrupted pattern is more interesting.
There are rules about perception, but not about photography.
You always end up with too many pictures to edit and too few that you feel 'got it'.
There really isn't anything that you could call 'bad' color. It all has to do with the amount of color you use and in what context it appears.
You have to have a lot of 'overage' so that your failures aren't the only thing you come home with. You've got to have a lot of things that were magnificent failures, but you want some magnificent successes.