One of the biggest problems that a photographer faces, is surely one of the "noise". Its effect is especially noticeable when using high ISO (up to about 400) and occurs mainly in the darker areas. In fact, in low light situations, the individual pixels that make up the sensor in our camera, they perceive the photons in slightly different ways, and this causes the so-called noise.
The best ways to reduce it?
First, try to use (whenever possible), ISO below 400. Minimize exposure time and, if you can, if they limited the dark areas contrast with some lighter ones.
It is clear that the noise is also linked to the camera we use. Professional machines are able to minimize this effect, unlike the cheaper (so-called entry level), which require more attention from the user.
These little tips are given from my own experience. And 'welcome anyone who wants to contribute to this discussion.