Act as a seasoned email marketing strategist with 10+ years of experience crafting high-converting newsletters. Create a detailed list of the top 5 dos and don'ts for writing effective call-to-actions (CTAs) in newsletters. Focus on [INDUSTRY], [TARGET AUDIENCE], and [GOAL] to ensure relevance. For each point, provide a clear example (e.g., 'DO: Use action-oriented language like "Grab your spot now!" for [EVENT TYPE] signups' vs 'DON'T: Use passive phrases like "Click here if you're interested"'). Include psychological triggers (e.g., urgency, exclusivity) and technical considerations (e.g., mobile button sizing, alt text for images). Format as a numbered checklist with bold headers for quick scanning.