With the Impr pant or PrtScrn key on your laptop, it will be copied and you can paste it in paint and from there save the image in the format you want, if you need more functionality or for some reason that key was not on your keyboard, you can use a third party application, such as Lightshot:
https://app.prntscr.com/es/

If you have win10, it comes with the application cutouts, with which you generate a photo of the part of the screen you want