If you want to screenshot your computer screen or a piece of it here is some ways to do so.
1. First step would be finding the “Print Screen” button on your keyboard.
2. Press it (Press simultaneously with Function button “FN” for laptops)
3. Go to paint
Press your right mouse button on the white space and choose Paste
And it is done!
You can crop a piece of the screenshot in paint or you can use this program “Snipping Tool” to choose what part of the screen you capture immediately