Take a full-screen screenshot in Windows 10 or 8.

To do so, press ⊞ Win + PrintScreen to save the screenshot directly to the file. This will prevent you from sticking to the paint first. The file is located in the Screenshots folder of your Photos folder. If the folder does not yet exist, it will be created.
If the previous method doesn’t work, try Fn + ⊞ Win + PrintScreen.

Take a full-screen screenshot in Windows 7 or Vista.

To do this, press the Print screen. It can be short, and usually occurs between the F12 key and the screen lock key. If you are using a laptop, you will need to press Function or Fn.
The image will be copied to the clipboard. You need to paste the view into the document to view the image.

• How to Take a Screen Shot (Screen Capture)

Take a screenshot of the active window only.

To do so, click the window whose image you want to capture, then press Alt+PrintScreen, or on some laptops Alt+Fn+PrintScreen.

• You will still need to paste it before you can save the image.

Take a full-screen screenshot

To capture an image of your entire display and save it to a desktop file, press ⌘ + ⇧ Shift + 3. The computer camera will make a shutter sound, and a file labeled “Screenshot [Date]” will appear on your desktop.
If you copy the screenshot to your clipboard instead of saving it to a file, press کنٹرول + control + ift + shift + 3. The image will be copied to the clipboard, and you can paste it into a document or image editor.

Capture part of your display.

If you only want to take a screenshot of part of your display, press ⌘+⇧ Shift+4. The pointer will turn into a crosshairs. Drag the crosshairs to create a box the part of the screen you want to capture.

• When you release the click, the computer will make a “shutter” sound and the image will be saved to a file on your desktop.

Capture a specific window.

If you want a screenshot of specific window, press ⌘+⇧ Shift+4. Then press Space. The cursor will become a camera icon. Click the window of which you want a screenshot.

• When you click, the computer will make a “shutter” sound and the image will be saved to a file on your desktop

• How to Take a Screen Shot (Screen Capture)