I see that, despite what the alarmist media would have your believe, humankind is evolving and getting better. This includes writers and other learned people who pass things on by oral and written means. This is important for any writer to understand. So now we have a starting point for writing. We know mental pictures exist, as the expression of concepts.
Good writers use words creatively to effectively communicate concepts and paint mental pictures.
These pictures then evoke emotional responses and bring about an understanding. Hopefully, the emotional responses aroused and the concepts communicated are positive ones, with a result of increased understanding of life. Even horror writers can do that, believe it or not. If all that sounds easy enough, it is, basically. You do the same thing, to some degree, every time you talk to someone.