The Elements of Style — The classic no-nonsense style guide for writers

Since 1920 (!), The Elements of Style has stood as the ultimate reference for grammar, style, and composition. Its advice is timeless, especially for copywriters and content creators. A sample: "Vigorous writing is concise. A sentence should contain no unnecessary words, a paragraph no unnecessary sentences, for the same reason that a drawing should have no unnecessary lines and a machine no unnecessary parts. This requires not that the writer make all his sentences short, or that he avoid all detail and treat his subjects only in outline, but that he make every word tell." — "Elementary Principles of Composition", The Elements of Style