This book provides a comprehensive view of Applied Behavior Analysis (ABA), covering both theoretical foundations and practical strategies to support individuals, especially those with autism or developmental disabilities. Through a clear and accessible approach, we explore effective tools such as reinforcement, extinction, modeling, and de-escalation techniques, offering evidence-based interventions. Additionally, the text emphasizes the importance of skill generalization and provides key recommendations for successful ABA implementation across various contexts. This integral approach serves as an essential guide for professionals dedicated to the development and well-being of individuals.