The Lasso Tool is the most basic version you can use. By clicking on a starting point in your canvas, simply drag your cursor around your object to create a path. The Lasso Tool will follow your mouse's exact movements all the way back around to the starting point.
Essentially, Dodge lightens selected pixels, while Burn darkens selected pixels. The importance of this is that while there are other ways to make adjustments to the overall brightness or hue of a photo, they generally apply the changes universally, which can give your photo a somewhat flat feel.
