There is a widely accepted rule called The Pareto Principle also known as the 80:20 rule. In short, it states that 80% of the results come from 20% of the efforts. I find that in learning photography, this can even skew much higher. This means that potentially improving 5% of your photographic knowledge in the right places, could improve your photography by 95%! By Mike Newton. Read more, at the Digital Photography School.
I am always reading articles and tips about the world of photography, and viewing many photographs. Doing so refreshes my perspective on the skills I have acquired and things to try. Endless!