For photography work, you need to take one picture of warm and cold tones, high and low saturation, but isn’t this the post-production process?

First of all, you have to understand what cold and warm colors are, and then what saturation is.

Photography is a tool, and specific expression needs to be achieved by technical means.

If it is a digital camera, you can achieve it very easily.

By adjusting the white balance, you can easily get warm and cool photos.

By adjusting the color and saturation, you can easily get photos with different saturations.

However, I believe that your teacher’s original intention is for you to achieve it through observation, use of light, and control of exposure, which is a bit difficult.