How to use aperture to get a nice blur effect. The depth of field can make a picture go from normal to amazing. Try using this to better your photos, this website has a lot more helpful information. -JPH
@Tiffany Massengale this will help you see what I was teaching you the other day. Study it and you can learn when to use small and wide apertures. remember the lower the number the wider that aperture.
Depth of Field: The pictures above change the aperture setting of the camera lenses, creating a sense of depth in their images. The larger the apertures (smaller F-stop number) and closer the focusing distances, the shallower depth of field is. Other example of Shallow Depth of Field: http://digital-photography-school.com/17-beautiful-images-with-shallow-depth-of-field