For a comprehensive understanding of the radioactive decay law, including its equation, derivation, graphs, and units, introductory modern physics textbooks are highly recommended. Most second-year university textbooks cover the topic, emphasizing the basic types of decay and the concept of exponential decay of radioactive atoms. Key learning outcomes include solving problems related to the number of remaining radioactive atoms over time and understanding decay chains and secular equilibrium. The discussion highlights that while the field is extensive, undergraduate courses typically focus on fundamental principles and simple applications of the decay law.