In school, there are recommended behaviors for integrated reading and writing courses, one of them is called written communication.
Written communication is very mantuary in writing when trying to prove a main idea or point of view across. Some ways to build on a well written communication skill, is by gathering necessary resources needed for a written piece. It could be having a news source or pulling together thoughts in to a well rounded passage. Rereading is very useful to ensure the reader is able to not only understand what is being told but able to enjoy it.
Overall there are a lot more skills to learn, but written communication is very key.