What major topic do both Edgar Allan Poe's "The Philosophy of Composition" and Stephen King's On Writing address?

Well On Writing is about Stephen Kings Life as a writer and serves as a book that guides people who would like to indulge in writing themselves. Edgar Allan Poe's book The Philosophy of Composition is about how good writers write and kind of gives a brief synopsis about how a good writer should write. So therefore I believe they both address, Writers craft, or how a write should write!