Trust your judgment
You can use the settings suggested on auto as a starting point for your own
Automation in exposure, as in other camera operations like focus, is, of course, a boon, and helps to reduce the agony of botched shots. But it carries with it a hidden deficit – it stops you thinking about what the exposure settings should be, so that when a scene is tricky, even for the camera’s smart metering, you may get an unpleasant surprise. Step one to staying in tune with exposure is to observe and note the three settings that your Nikon’s automatic exposure is giving you: aperture, shutter speed and ISO. Too obvious to mention…? You’d be surprised at how few photographers know what settings they actually use. Step two is to successfully predict when you need to override auto, and by how much. When you’re getting that right most of the time, you’re ready to take over any time the situation calls for it, and the confidence that comes from that puts you firmly in charge.
Learning what settings your camera picks is the first step to choosing your own