Selections are a great way to work on parts of your image independently, rather than manipulating the image as a whole.
Once you’ve selected a part of an image (e.g. a person’s head or other object), you can then manipulate this object separately from the rest of the image. This means you can cut the object out; add drop shadows; adjust the brightness/contrast; warp it; apply effects and filters easily – in fact, anything you like!
In this series of tutorials you’ll explore the various selection tools in Photoshop. On this page we start with the marquee and lasso tools.