Photoshop CS contains a number of highly effective automatic features that fix pictures with very little effort on your part. These are all you need for certain kinds of jobs you might face. However, when you want more control, you can dig down into some of the more technical features and controls available in Photoshop.
Just to be a good sport about it, you’ll try the automatic adjustments first. A little later, you’ll make adjustments using manual controls on another copy of the lesson image.