Quantum mechanics is a branch of physics that studies the behavior of matter and energy at a very small scale, such as atoms and subatomic particles. Quantum chemistry, on the other hand, is a field of chemistry that applies the principles of quantum mechanics to understand and predict the behavior of molecules.
There are many great books on quantum mechanics and quantum chemistry for beginners. Some popular choices include "Quantum Mechanics: The Theoretical Minimum" by Leonard Susskind and Art Friedman, "Quantum Chemistry" by Donald A. McQuarrie, and "Introduction to Quantum Mechanics" by David J. Griffiths.
While a strong understanding of math is helpful in understanding quantum mechanics and quantum chemistry, it is not necessary. Many introductory books on these topics provide a basic overview of the necessary math concepts and equations.
Quantum mechanics and quantum chemistry have numerous applications in various fields such as materials science, nanotechnology, and pharmaceuticals. They are used to study and design new materials, develop more efficient energy sources, and understand chemical reactions.
Quantum mechanics and quantum chemistry are complex and constantly evolving fields of study. While it is possible to have a deep understanding of these topics, it is not possible to fully understand them due to their abstract and counterintuitive nature.