Books recommended for learning about amplifiers and op-amps include "The Art of Electronics" by Horowitz and Hill, and "Microelectronic Circuits" by Sedra and Smith, which is considered essential. "Op Amps for Everyone" by Ron Mancini and "Design with Operational Amplifiers and Analog Integrated Circuits" by Sergio Franco are also highlighted for their comprehensive coverage of theory and practical applications. Additionally, "Practical Electronics for Inventors" by Paul Scherz and Simon Monk is suggested for hands-on learning. Online resources such as tutorials and videos can further enhance understanding. These materials provide a solid foundation for anyone interested in electronics.