What are the basic requirements of photography? Like a structure or something! ?

Composition is a formal art, which plays an important role in highlighting the theme (subject) in photographic works. There are many forms and techniques of composition, but they should all be carried out around the theme, otherwise it will affect the whole body. Besides the content, the form of a photographic work is mainly composed of three elements: composition, light and color. Of course, there is no strict distinction between these three elements, and both color and light can be elements of composition. It can be understood that composition, as the soul of a photographic work, is an indispensable part of serving the theme.