This book presents a comprehensive exploration of reservoir computing as a powerful, data-driven framework for modeling, predicting, and controlling complex nonlinear dynamical systems. Grounded in the foundational principles of chaos theory and neural computation, the text establishes reservoir computing as a computationally efficient method that learns a system's dynamics purely from time-series data, without requiring knowledge of the underlying governing equations. The core of the work demonstrates the framework's remarkable success in forecasting chaotic behavior, moving beyond short-term prediction to achieve the long-term reconstruction of a system's characteristic attractor and the creation of faithful "digital twins." Through rigorous analysis and diverse examples, from canonical chaotic systems to complex spatiotemporal dynamics, the book validates reservoir computing as a robust tool for scientific modeling. Building on this predictive foundation, the text ventures into advanced, high-impact applications, most notably the formidable challenge of forecasting catastrophic "tipping points" from seemingly stable data, with a compelling case study on the potential collapse of the Atlantic Meridional Overturning Circulation. The book highlights the versatility of the approach through applications in real-time robotic control, dynamic memory storage, parameter tracking in non-stationary systems, and robust weak-signal extraction in extreme noise. Furthermore, it addresses practical limitations such as data scarcity and noisy environments, while also looking to the future by exploring the frontiers of physical and quantum reservoir computing and surveying other state-of-the-art machine learning models including Transformers, Kolmogorov-Arnold networks, Long Short-Term Memory networks, and reinforcement learning. This positions data-driven methods at the vanguard of modern scientific inference, analysis, and control. Designed for graduate students and researchers, this interdisciplinary work emphasizes the synergy between data-driven machine-learning models and nonlinear dynamics, showing how reservoir computing offers powerful tools to decode, predict, and control the behavior of complex systems across science and engineering domains.