You can take a screenshot on an Apple Mac in a couple of different ways.
Take a screenshot of part of a screen
To take a screenshot of part of the screen, click Shift, CMD 4. Then drag the cursor to select the part of the screen you want to capture. As soon as you let go, an image will be saved (normally to your desktop).
Take a screenshot of a particular window
To take a screenshot of a window, click Shift, CMD 4 and then space. Then click the mouse to capture the screen.
To capture a screenshot
To take a screenshot on Windows 10, simply click the Print screen key. This will save an images to your pictures folder
To take a screenshot on your iOS device
On an iPhoneX and above, hold down the Side button and the volume up button. This will save an image to your pictures folder.
On iOS devices with a home button, click the Side button and the home button to save a screenshot.
To take a screenshot on your Android device
Press and hold the power and volume buttons.