Light in itself is not good or bad and it can not create a good photograph, but depending on the characteristics of the light it can make our photographs better or worse. I've gone through my photo library and have picked out a few photos to show how light can change a photo. Here's one example I came up with.
Both shots are the same creek taken from the same spot using all the same equipment. The difference is the time of day and the direction of the sunlight.
One reason I'm talking about light in the very first class is it is the single most important part to photography. When shooting landscapes and nature you have to take the light God gives you and either work with it or pass. There is no amount of camera gear or post-processing editing that would make the first shot look like the second.
Understanding light is foundational. Everything else is secondary.