"Theory of Quark and Gluon Interactions" by Francisco J. Ynduráin is a comprehensive textbook that addresses the fundamental aspects of quark and gluon physics. In this fourth edition, the topic of quantum chromodynamics (QCD) is discussed, which is essential for understanding the strong interactions between quarks and gluons. The book is aimed at readers with a basic knowledge of field theory and particle phenomenology. Ynduráin presents the theoretical concepts in a didactic manner and consistently links them to experimental results. This approach allows readers to follow the developments in modern research. The fourth edition also includes new sections on effective theories of heavy quarks, as well as expanded material on lattice QCD and chiral perturbation theory.