You learn by writing short stories. Keep writing short stories. The money's in novels, but writing short stories keeps your writing lean and pointed.
It is a cardinal sin to bore the reader.
The human species really could have faced global thermonuclear war. During seventy years of Cold War we grew used to it.
In the world of words the imagination is one of the forces of nature.
Never fire a laser at a mirror.
The dinosaurs became extinct because they didn't have a space program.