The discussion centers on the concept of modified theories of gravity, particularly in relation to general relativity (GR) and Modified Newtonian Dynamics (MOND). Participants clarify that MOND is often considered a more respected term than "modified theory of gravity." There is uncertainty about the specific interests of the original poster regarding modified gravity theories. Recommendations for further reading include "Beyond Einstein Gravity: A Survey of Gravitational Theories for Cosmology and Astrophysics" by Capozziello and Faraoni, which focuses on f(R) theories, and "Classical and Quantum Cosmology" by Calcagni, which surveys various gravity theories and discusses quantum gravity. The suggestion to utilize Amazon's Look Inside feature for exploring the content of these books is also made.