User onboarding is a crucial experience that introduces new users to a product and helps them achieve its promised value. A well-designed onboarding flow can lead to increased user engagement, retention, and ultimately, revenue growth. Research has shown that customers with a positive perception of their onboarding experience are less likely to churn within the first 21 days of using a new product, and users who complete the onboarding process are up to 21% more likely to pay for a mobile app. To build an effective onboarding flow, it's essential to identify each user's unique "aha" moment, use education techniques such as videos and interactive guides, and provide contextual information that caters to individual user goals and expectations. Common mistakes to avoid include planning the onboarding process at the last minute, designing by committee, catering to the average user, ignoring early warning signs of churn, sending time-based messages, focusing solely on the first visit, and optimizing for a single user. Successful onboarding experiences connect users with value quickly, using techniques such as offering immediate value, allowing users to onboard at their own pace, and triggering tutorials based on user actions. By following these best practices and avoiding common pitfalls, businesses can create an effective onboarding flow that sets them up for long-term success.