This document outlines April Dunford's advice for effective messaging for startups. She recommends answering three key questions in messaging: 1) What is the product? with a brief and simple explanation, 2) Is it for me? by explicitly targeting personas, and 3) Why buy from you? focusing on value rather than features. Dunford advises segmenting the market and targeting messaging explicitly to different personas. She also stresses the importance of deep explanations using use cases, demos and other materials to clearly convey what problems the product solves for customers.