"Introduction to Quantum Mechanics" is a comprehensive textbook aimed at advanced undergraduate physics students. It provides a clear and accessible introduction to the theory and applications of quantum mechanics. The new edition includes significant changes and additions, including a new chapter on symmetries, as well as numerous new problems and examples that facilitate the understanding of complex concepts. The book is not only important for students but also serves as a reference work for professionals in related fields such as engineering, mathematics, and chemistry. The structured division into theory and application allows readers to grasp both the fundamentals and the practical aspects of quantum mechanics. With a focus on numerical problems that can be solved using computers and a consolidated treatment of time-dependent potentials, this book is an indispensable tool for the study of modern physics.