Photography: What do exposure time, F value and ISO speed mean respectively? What's the role? How and under what circumstances?

What do exposure time, F value and ISO speed mean respectively? What's the role? How and under what circumstances? Exposure time: usually called shutter, it is used to control the time when the imaging system receives light (the length of opening time). Controls the "sharpness" of moving objects in the exposure combination. F value: usually called aperture. You can control the amount of light entering the lens (aperture size). Control the clear range of the scene in the exposure combination. ISO (light sensitivity): it is the setting of light sensitivity speed. Control the "sensitivity" of the imaging system to receive light (the higher the ISO, the faster the speed of receiving light, and vice versa). It plays an auxiliary role when the exposure combination cannot meet the exposure.