Magnetic property, which is the response of a material to an external magnetic field, is one of the fundamental properties of a material. Nowadays, magnetic materials have been applied everywhere, yet further investigations are still active and important for advanced technology. This lecture is an introduction to magnetic properties in solids and related research frontiers. By taking this course, students shall understand the fundamental knowledge in magnetic properties and its importance to materials science; be familiar with representative materials and experimental characterization methods for paramagnetism, diamagnetism, ferromagnetism, and antiferromagnetism, etc.; understand magnetic interactions, magnetic orders and related theoretical models; understand electrical transport properties in solids under a uniform magnetic field. This lecture will be emphasized on experimental method and data analysis.