How to make my nikon d3000 focus on its own?

This probably sounds like a very stupid question but please don't make fun of me haha. How do i set it to where the camera does the focusing, not me?

Make sure the focus switch on the lens is set to auto, then half press the shutter button to have the camera focus automatically.

There's a switch on the side of the lens. Switch it to auto. You can also switch the camera to full auto so the camera does most of the work for you. All you have to do is point & shoot!