As a serious amateur I have read and studied everything to do with taking pictures & using my camera but you eventually learn that no mater how good you are at using the tools, you have no control over the light and the hardest thing to learn is actually composition.
I used to go on vacation & always take lots of images and then bin most once I got home, then as my knowledge & experience grew I would take more time at the shoot, delete the obvious no hopers there & then & only bring home the better shots. I then reached the stage where I would bring home many good shots but they were good shots of nothing, lacking a focus or point of interest & only I really knew the intentions. One thing I have learnt is that when you see a shot stop & capture it as it's no good saying I will do it on the way back !
Now I spend more time looking at a scene, evaluating it and finding the best point from which to shoot only to be defeated by the weather or light, good old british summertime !