The tutorial contains theoretical material related to methods for studying the properties and behavior of macrosystems - systems consisting of a very large number of particles. These are thermodynamics, molecular kinetic theory and statistics (both classical and quantum). In addition to a fairly large number of examples, at the end of each chapter there are tasks for the corresponding material. It is shown how, in the opinion of the author, one should approach their solution. Tasks are closely related to the main text, often being its complement and development. For students of physical specialties of universities.