When cropping an image, Photoshop is most commonly used. However, it costs, and is not the best quality photo cropping tool either. Using Preview would provide free cropping of images easily and effectively.
2. Size editing
When editing sizes of photos, using Preview is more useful than using Photoshop.
Only when editing a PDF, you can add a sign using Preview without printing.
Sometimes, Photoshop isn't the best option for editing images. A preinstalled software, Preview, could come in handy too.