This book is compiled based on the results of studies from various reading sources and research experiences on education ranging from elementary school to higher education. This qualitative, quantitative, PTK, and Research and Development Approach book is expected to complement research books for S1, S2, and S3 students as well as educators, researchers, practitioners, and other parties who care and want to explore the field of education through research. The book consists of five parts that can be studied. Part 1, Definition and Scope of Educational Research. Part 2, Quantitative Research and examples. Part 3, Qualitative Research and examples. Section 4, Class Action Research and examples. Section 5, Research and Development and examples. Each section of the book presents several chapters accompanied by practical examples of the author's research results.