To take a screen-shot in Microsoft Windows:
Method 1. Take a screen-shot of the visible portion of your screen
To take a screen-shot of the visible portion of your computer screen – Press Alt + Print Screen by holding down the Alt key and then pressing the Print Screen key (The Print Screen key is near the upper-right corner of your keyboard).
This will save the screen shot to your computer clipboard. You will now need to paste the image into an email, Word doc., PSD, etc. in order to see it.
Method 2. Take a screen-shot of the visible portion of your screen & save it directly to a file
If you’d like to save a screen-shot directly to a file on your computer without having to paste it in –
Press the Windows key and the PrtScr key simultaneously.
The image will be saved to the Screenshots folder in your Pictures folder.
Method 3. Use the Windows Snipping Tool
In Windows Vista and 7, click the Start button, select All Programs -> Accessories -> Snipping Tool.
In Windows 8, navigate to the Start screen, and then start typing “Snipping tool” in the search bar. Select the snipping tool from the results.
In Windows 10, click on the Windows icon in the toolbar, and find the Snipping Tool inside “Windows Accessories.”
In the snipping tool window – select “New” and then draw a box around the area of the screen your want to take a picture of. Select “Save As” and enter a name for your image to save.
To take a screen-shot on your Mac:
Method 1. Take a screenshot of your whole screen
1. Press Command (⌘)+ Shift + 3.
2. Find the screenshot as a .png file on your desktop.
Method 2. Take a screenshot of part of your screen
1. Press Command (⌘)-Shift-4. You’ll see that your cursor changes to a crosshair pointer.
2. Move the crosshair pointer to where you want to start the screenshot.
3. Drag to select an area. To adjust the area, hold Shift, Option, or the Space bar while you drag.
4. When you’ve selected the area you want, release your mouse or trackpad button. Or to cancel, press Escape (esc).
5. Find the screenshot as a .png file on your desktop.