Photoshop selections are your bread and butter. Anything within the moving dotted line can be edited, cut, or separated. If you're comfortable selecting the image you want to separate, you can move on to You have a variety of different selection tools available, each with pros and cons. The most commonly used tools include:
Shaped Selections: The icon looks like a dotted box. Click and hold the icon for more shapes, which allow you to cover any basic item. The Lasso Tools: You have a lot of options here, each of which requires you click the mouse, then trace out the object with your mouse. Clicking again creates an anchor point, then complete the shape to end the selection. Quick Selection: The icon looks like a paintbrush with a circular dotted line around the brush. This shape automatically creates selections following the edges of shapes in the image. Magic Wand: Hidden behind Quick Selection, or vice versa, click and hold on the "Quick Selection" button to find it. The Wand selects all pixels in a similar color range to the place you just clicked. Pen Tool: Icon looks like a regular fountain pen. This is the most powerful tool you've got, but also the most time consuming to use. The pen tool creates "paths" with anchor points that can b be adjusted on the fly, giving you more control than basic selections.