So here's a thread...
10 Tips for Writing copy that sells like hell via Copywriter's Handbook by Robert W. Bly.
Put yourself in the reader's shoes and ask yourself, "Would I buy this product? Is the copy persuasive yet understandable?"
Your headline is what begins selling your product/service to the reader. The body paragraphs will expand on that idea.
If your product/service has multiple selling points, organize them in separate, smaller sized sections to make it easier on the reader.
Short sentences are much easier to read than longer ones. Switch between longer and shorter length sentences to change up the copy and keep the reader engaged.
Small, simple words help you communicate with the reader much easier. Big words are annoying and distract you from the overall message of the copy.
Stay away from technical terms unless you are sure your audience will understand it or unless it precisely communicates your message. Otherwise, it's just confusing fluff that isn't needed.
You want to keep your audience interested. Avoid redundancies, run-on sentences, wordy phrases, passive voice, and unnecessary run-ons.
SPECIFIC. SPECIFIC. SPECIFIC.
Start selling with your FIRST line of copy. The finished product should be selling the reader from beginning to end.
Write like you talk. People enjoy reading clear, simple copy that is easy to understand. Write using pronouns as well as colloquial expressions to draw in the reader.