The textbook gives an idea of ​ ​ the neutron diffraction experiment, reveals the terms, concepts and methods used in determining the crystal and magnetic structures of the crystal from the data of neutron diffraction measurements. The manual expands the knowledge necessary to work with computer packages of FullProf programs: (WinPLOTR, Studio, BasIreps, PROGRAM K_SEARCH, etc.), VESTA. One of the advantages of neutronography is that it can be used to obtain information about the crystalline and magnetic structures of a substance. For senior and graduate students interested in gaining additional knowledge on the application of neutron diffraction in solid state physics and magnetic phenomena physics.