This book redefines attention in the digital age, moving beyond scarcity to address fragmentation and overload. It introduces "attention capital" an asset to cultivate, manage, and invest, encompassing cognitive depth, selective filtering, and engagement quality. Extending engagement economics beyond marketing, it highlights its relevance to personal and societal well-being, differentiating meaningful engagement from passive consumption. Tracing the historical evolution of attention, the book refines theories to account for algorithmic curation, hyper-personalization, and affective attention. It explores the creator economy, a multidimensional framework for cognitive, emotional, and social engagement, and the impact of algorithmic feedback loops and sensory modalities. Addressing challenges like misinformation, polarization, and ethics, it advocates for algorithmic transparency, data privacy, user empowerment, and "Time-Well-Spent" principles. It examines Web3, the Metaverse, and evolving regulations, emphasizing critical consumption, media literacy, and alternative business models. The book stresses self-awareness, resilience, and ethical engagement.