Ask the photographer a question

When the lens cap is open, the photo may be completely black because the exposure time is too short, such as the shutter time is too fast and the aperture is too small. The shutter button may not be able to be pressed due to the inability to achieve focus in autofocus mode.

In fact, SLR cameras are not much different in nature. If you know how to use a Canon SLR, you should be able to easily operate a Nikon. If you adjust the mode correctly, you should be able to get the correct aperture and shutter.