This book introduces the core principles of research, combining theoretical foundations with practical models and tools. It explores essential concepts—such as research philosophy, question formulation, study design, data collection, and analysis—and how they underpin responsible inquiry across disciplines. The book emphasizes innovative frameworks like ONDAS, Matryoshka Model, and Truss Structure Model, supporting systematic and flexible research processes. It also highlights the integration of digital tools, including Mendeley, NVivo, SPSS, Mplus, and AI applications, to enhance efficiency, accuracy, and reproducibility. Ethical standards, societal impact, and transparent practices are conveyed throughout, along with step-by-step tutorials, visual models, and exercises to empower learners at every stage. Whether for academic development, professional projects, or personal growth, The Fundamentals of Research Methods provides a solid foundation for conducting impactful, ethical, and innovative research that advances knowledge and society.