How to learn manual operation in photography?

The so-called manual operation in photography is to control the exposure according to the photographer's intention, which mainly involves aperture, shutter, sensitivity, white balance, exposure compensation and the use of flash. The most important thing is the rational use of exposure combination, that is, the clever use of aperture shutter. It is impossible to specify any parameters here.

What are some examples? For example, taking close-ups of flowers or people generally requires a small depth of field and blurring the background, and a large aperture is enough. When shooting scenery, if you need a clear field of vision from far and near, you should use a small aperture to a large depth of field. Taking pictures in front of a dark background is easy to overexpose and needs to be artificially reduced. Taking pictures in front of a bright background is easy to be underexposed, and it is necessary to artificially increase the exposure. In the case of insufficient illumination, but the shutter speed cannot be reduced, we can consider increasing the sensitivity appropriately. Wait a minute.

In short, if you want to use manual exposure freely, you must be familiar with relevant knowledge. In order to achieve the desired effect, what methods can be used to control it.