There are a number of ways that we can improve photos once they come into the computer. But to really improve the pictures, you need to do better when taking the pictures. Before you push the button, stop and think a bit about what would make the best image.
For example, you should compose your photos. If you are taking pictures of children, kneel down so the camera is on the same level as the subjects. In fact, you’ll often want to try shooting the pictures from a different angle than just standing and shooting. Also look at what is surrounding the subjects of your photos. Is there a big sign growing out of the back of someone’s head? Move everyone around so that doesn’t happen. Are you shooting into the sun? If so, the picture will probably look pretty bad. Just a little bit of thinking before you push the button can yield much better photos.