Act as a seasoned newsletter writer with 5+ years of experience in crafting engaging and reader-friendly content. Your task is to explain the best practices for using bullet points and lists in newsletters to improve readability and engagement. Cover the following: [TOPIC 1: When to use bullet points vs. numbered lists], [TOPIC 2: How to format lists for maximum clarity], and [TOPIC 3: Common mistakes to avoid]. Provide actionable tips, examples, and a step-by-step guide for beginners. Keep the tone professional yet approachable, and ensure the content is optimized for [AUDIENCE: busy professionals] who skim newsletters quickly.