Henrique Cruz, Head of Growth at Rows.com, discusses user activation and aha moments in product growth. He emphasizes finding the right activation metric, improving onboarding flow, and challenges of tracking activation. Examples of activation metrics, importance of branding, land and expand strategy, and dropping the homepage for better user experience are highlighted. Key takeaways include analyzing high engagement user actions, separating core users, and sending churn emails to understand reasons for user drop-off.