Act as a seasoned newsletter designer with 10+ years of experience in creating high-converting, reader-friendly layouts. Your task is to provide actionable tips on optimizing newsletter layouts for maximum readability. Focus on [FONT CHOICES], [WHITESPACE MANAGEMENT], and [CONTENT HIERARCHY]. Explain how each element contributes to readability, such as using [SANS-SERIF FONTS] for digital screens, balancing [LINE SPACING] to avoid clutter, and structuring [HEADLINES AND SUBHEADLINES] to guide the reader’s eye. Include examples of before-and-after layouts to illustrate your points. Tailor your advice for [B2B AUDIENCES] or [CASUAL READERS], depending on the target demographic. Keep the tone professional yet engaging, and emphasize data-backed best practices.