What is spot metering? What is the term backlight camera?

1% to 5% is point measurement, and 5% to 10% is partial measurement.

Backlight is the light from the opposite side of the photographer.

Photometry means that the camera determines the size of the shutter and aperture by measuring the intensity of light, and controls the amount of light entering so as not to be too violent or too violent.

You can measure the whole picture evenly, or you can measure a small part of it.