Christoph Behn has worn many hats throughout his career: founder of Kartenmacherei, where he turned a simple idea into a thriving e-commerce brand; investor at Better Ventures, supporting early-stage teams on their path to sustainable growth; and today CEO at Celebrate, where he leads product teams directly. In this talk, he looks back on the principles and lessons that shaped his journey, sharing both the successes and the hard mistakes that taught him the most. With honesty and practical stories, Christoph reveals the principles that now guide his leadership and offers product people the chance to learn from his experience without repeating the same pitfalls.