Four basic premises of writing: clarity, brevity, simplicity, and humanity.
Writing is thinking on paper. Anyone who thinks clearly should be able to write clearly-about any subject at all.
You learn to write by writing.
A simple [writing] style is the result of very hard work.
Writing and learning and thinking are the same process.
One of the saddest sentences I know is "I wish I had asked my mother about that." Or my father. Or my grandmother. Or my grandfather. As every parent knows, our children are not as fascinated by our fascinating lives as we are.