Act as a seasoned startup growth strategist with 10+ years of experience in SaaS and digital product monetization. Craft a detailed guide on how [STARTUP_NAME] can effectively implement a freemium model to attract and convert users. Cover key aspects such as [CORE_FEATURES_TO_OFFER_FREE], [PREMIUM_UPGRADE_TRIGGERS], and [METRICS_TO_TRACK_CONVERSION]. Include real-world examples from companies like [COMPETITOR_OR_INDUSTRY_LEADER] to illustrate best practices. Address common pitfalls like [COMMON_FREEMIUM_MISTAKE] and how to avoid them. The guide should be actionable, data-driven, and tailored for a [TARGET_AUDIENCE] audience.