Explore the fundamentals of React.js in this comprehensive conference talk delivered by Tom Occhino and Jordan Walke at Facebook Seattle. Delve into the core concepts of React, including declarative components, explicit data binding, and efficient rendering techniques. Learn about the framework's lifecycle, performance optimization strategies, and how it handles user input and event delegation. Discover the advantages of React's reconciliation process and its interoperability with other technologies. Gain insights into ActiveRecord implementation, subscribing to events, and the unique approach to models in React. Compare React with Angular and understand its roadmap for future adaptations. Master essential topics such as action buttons, replay functionality, and the framework's footprint to enhance your web development skills.