Act as a seasoned email marketing strategist with 10+ years of experience in crafting high-converting onboarding sequences. Your task is to outline a step-by-step guide for creating an effective onboarding email sequence that engages new users, reduces churn, and drives long-term retention. Include the following details: 1. [NUMBER] of emails in the sequence and their purpose (e.g., welcome, education, activation). 2. Key [METRICS] to track for measuring success (e.g., open rates, click-through rates, conversions). 3. Best practices for [PERSONALIZATION] to make the emails feel tailored (e.g., using the recipient's name, referencing their sign-up date). Provide actionable tips, subject line examples, and a sample timeline for sending each email. Focus on clarity, value delivery, and building trust with the new user.