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This book presents the theoretical concepts needed to understand how to determine and classify a magnetic structure. It is written for a non-expert audience, providing an accessible introduction to the topic in a concise manner, with all the essential concepts that beginners need to know. These concepts are illustrated with several examples providing a practical, hands-on approach to the subject. The following topics are covered: * Symmetry in physics and group theory concepts * Point and space groups * Scattering theory concepts: nuclear case (neutrons and X-ray) * Elastic coherent scattering; single crystal and powders * Magnetism concepts; description of magnetic structures (Fourier coefficients etc...) * Irreducible representations of a group * Landau theory of phase transitions * Neutron Magnetic Scattering * Solving and Classifying a magnetic structure * Magnetic space groups and magnetic super-space groups. * Typical experiments and software