Screencap is a simple yet effective tool that can be used to capture a screenshot of a webpage. The basic function is very straightforward. All you need to do is hold down the command key and press the space bar. Then, you just select a specific portion of the page you wish to save. Once it is done, click the icon to save the image file.
But before you start using the feature, you must understand how to navigate the screen properly. This will help you to take the best possible screenshots.