  This is a collection of my lecture notes on the higher-spin theory course
given for students at the Institute for Theoretical and Mathematical Physics,
Lomonosov Moscow State University. The goal of these lectures is to give an
introduction to higher-spin theories accessible to master level students which
would enable them to read the higher-spin literature. I start by introducing
basic relevant notions of representation theory and the associated
field-theoretic descriptions. Focusing on massless symmetric fields I review
different approaches to interactions as well as the no-go results. I end the
lectures by reviewing some of the currently available positive results on
interactions of massless higher-spin fields, namely, holographic, Chern-Simons
and chiral higher-spin theories.
