The key to learning anything is to practice constantly but this does not mean endlessly running around snapping away at everything that moves... or doesn't.
Observation is key to this process. Observe the scene, predict the shot, try the shot until on the camera display, it looks ok.
Pay attention to how you have adjusted your settings throughout. Now go home and take a look at the shots full size.
Take note of the changes in each shot and how those changes moved you closer to or further away from what you were going for.
