This is my response to a question by another writer asking about whether to include a black person in their story. Others were tending to say that she might struggle and should write what she knows.
Write what you know does NOT exclude black people. You know them. Even if you have never met one. You know them because they are people first. They do not define themselves by their blackness. The minor character in your story will define herself as a person, as a friend, as a mother, as a lover, as a doer of whatever she does for fun or money. Write a person. Describe black skin. It will will succeed. Guaranteed.
The correct short name for black people isn’t blacks, it’s people.