This book provides you with a clear, comprehensive, and easily understandable insight into elementary geometry and related fields. It contains everything you need to prepare for bachelor's or state examination tests in the context of geometry. It is also well-suited as a reference work for mathematics teachers and anyone working in or interested in mathematics. In addition to the familiar Euclidean geometry from school, you will find insights into non-Euclidean geometries, convex geometry, discrete geometry, and topological geometry. A series of exercises interspersed throughout the text deepens your understanding and allows you to study the material independently with ease.