To get a screenshot on your computer, press the "Prt Sc" or "Prt Scn" key on your keyboard.
Next, open the Start menu and open the "Paint" program under the "Programs" icon. Once Paint is open, click on the Paste option on the upper left corner.
As an alternative, you can also paste the image by pressing the "V" key and the "Ctrl" key simultaneously after opening the program.
After that, all you have to do is to save the image. You can do this by using the shortcut "Ctrl" and pressing "S".