Best advice is to look at the EXIF details... that the beauty of digital that you had to do manually with film. In the "old days", we used to have to write down our setting in a field journal whenver we snapped a photo if we wanted to learn from our sucesses and mistakes. Nowadays, just grab a bunch of photos and examine the built in data to see what you are doing correctly and incorrectly.

Aperture, f-stop, ISO all tell a story about your photos.. As LaWanna mentions, perhaps you were using too small an aperture and therefore you didn't allow enough light to come in leading to camera shake from a slow shutter speed. What was the ISO set to? Lower isn't always better so if you are getting long shutter speeds at say F10, and you want to maintain F10 instead of moving down towards F2.8... you can increase the ISO which will allow you to get a faster shutter speed.. thus less shake.

I highly recommend the book Understanding Exposure by Bryan Peterson. A well done book that provides lots of info about what I'm talking about.