Photoshop offers several ways for you to select parts of an image, all of which can be found in the Tools window. The Rectangular and Elliptical Marquee tools are on the top left: just right-click the icon to reveal every option. Once a tool is selected, dragging the cursor in an area will create a – surprise! – rectangular or elliptical selection. Now you can only paint or erase in that particular place. The Lasso tool and its extra options can select more specific areas. Polygonal Lasso gives you control over the borders by creating connecting points, while the Magnetic Lasso attaches itself to whatever shaped edges are closest as you drag the cursor around the canvas.