Another suggestion I'll throw out there is to go to a photography message board that is friendly to posting photos, and post some of your shots with a wide-open invitation to critique - NO FILTERS! Even the harshest critique can be a wonderful tool to learn. Unfortunately, many folks lately are a more sensitive bunch than 5, 10, or 15 years ago, and don't seem to take criticism as well, so some boards that were wonderful critique places to help really learn what you are doing right or wrong don't have as many folks willing to offer good constructive critique because they've been stung by it too often lately, by folks who take it personally, over-defend themselves, and generally don't take criticism well.
I learned more about photography in 1 year on a dpreview discussion board than I had in the previous 25 years of shooting with a manual SLR - because up to that point, I had only been a snapshooter, uninterested in the actual workings of the camera. Film speed was some silly number, aperture and shutter were mostly a mystery, other than fast shutters = less blur. I had a manual camera, but it had an exposure meter - I didn't really know what it did - I just tried to get the little needle to be somewhere in the center.
Once I got on the boards when I bought my first advanced digital, I had seen some truly amazing photographs, some of which were being critiqued for some slight which I couldn't even notice. And the photographer always took it well, with a 'thanks' or 'you're right' and would come back with another, even better shot using that info. So I decided to join in. I posted shots taken mostly in P or Auto mode, that I thought were quite good...and within just a few weeks, I had learned that I never paid attention to whether horizons were crooked, didn't know the rule of thirds, didn't know how to control depth of field with aperture, needed to apply perspective correction, often blew highlights, oversaturated and clipped colors, had too much noise because ISO was on Auto and was choosing higher than needed, had resaved the original image multiple times causing bad compression artifacts, was using standard sharpen which was leaving horrible white halos at contrast lines...it went on and on. I never possibly could have imagined how many things I was doing wrong. Yet, every time those were mentioned, and I could see them in my own photos, I rarely made that mistake again unless it was unavoidable, and was forever conscious of those things. And each time I'd post, I'd get better.
So go with an open mind, don't take things personally, and open yourself up to critique by others who know much more than you do - and learn from your mistakes. And practice constantly as others have mentioned. Imitate others - try to match what they did, and find out how they did it...if you come up short of their effort, see if you can analyze why. Try taking a series of shots of the same thing while adjusting one particular parameter of the camera - such as aperture - and see what differences it makes in each shot. Did the subject gain or lose color, become brighter or darker, or did the focus narrow or expand? Seeing how each setting actually changes your end result is a wonderful way to learn precisely what those settings do.
Hope all that helps!
The key is knowing what the camera and the scene is telling us. And read the manual, rtm, rtm... 
