I want to know the difference between depth of field, foreground and macro.

Generally speaking, the depth of field refers to the clear range before and after focusing. Generally speaking, the aperture is large, the focal length is long and the scene is deep. The control of depth of field can produce the effect of blurring the background and highlighting the subject.

Foreground is generally used for landscape photography. The choice of big scene and foreground content can make photos echo each other and set off each other.

Macro is a subject, which is mainly used to show the details of close objects.