If You Write to Someone Who has Adifferent Background or Experience From Your,What do You Need to do ?

Communication in our lives is very important, We often meet people who the background, knowledge and skills are different context, we can communicate with each other, exchange each other's life experience and social experience, But there are many kinds of ways to communicate, the way if you want to write, but also what kind of methods to communicate it to do good?
I think the first course,We need to introduce ourself to the reader, may be able to include their interests, expertise, background and so on ... ..
Second to understand the contents of this article for the reader what kind of age, or how a particular object
The third focus of the content to be able to resound

I think the three point are the most basic understanding should be , the next step is to make writing a literary work of remarkable richness and vitality .