(this is an opinionated question. i just wanted more people's perspective) among the elements of art, [line, shape, form, space, texture, value, color] which are the 3 most important ones and why?

For me personally, I think line, shape, and color are the most important. Lines are useful for almost everything. Everything is a line. The same goes for shapes. Almost everyone uses shapes. Weather for guidelines, or abstract art. And lastly, color give everything more definition.

Hey here is your answer

A  documentary film  is a nonfictional motion picture intended to document some aspect of reality, primarily for the purposes of instruction, education, or maintaining a historical record.example:     20,000 days on earth