Photography is always a continuing education. You really have to enjoy what your doing. For me, I buy all the photography related magazines. I found these two publications useful, the local Digital Photography edition and this Imag Photography magazine.
In this issue of Imag photography magazine, it tackles the subject of negative space. Actually I don't know what this means. Negative space is the area that fills up the rest of the frame, usually a solid background color. The article helps you achieve on using negative space on your photographs.
Although I studied under 2 photography teachers, nothing can really beat if you go out and shoot. It's just like driving or cooking, if you don't do it everyday, then you will never learn.