Raymond Camden discusses the fundamentals necessary for hybrid mobile development, particularly emphasizing the importance of having a solid understanding of HTML, CSS, and JavaScript. He highlights the need for web developers to leverage their existing web development skills to create mobile applications using frameworks like Apache Cordova and Ionic, while also acknowledging the additional skills required for effective mobile app development. Camden underscores the significance of familiarizing oneself with tools such as Ajax for data loading and asynchronous operations in JavaScript, as well as the use of browser developer tools for debugging. He encourages developers to continually refresh their knowledge of web technologies and experiment with various tools, recommending resources from Mozilla Developer Network for learning and reviewing HTML, CSS, and JavaScript basics and advanced features.