If you are new, click here for the full list of lessons. The lectures cover all of the key elements in most semester-long game theory courses, including: strict dominance, weak dominance, Nash equilibrium, mixed strategies, subgame perfect equilibrium, backward induction, expected utility theory, repeated games, Bayesian Nash equilibrium, perfect Bayesian equilibrium, and signaling games.
Once you have mastered introductory game theory, consider learning about its applications or delving deeper into its mechanics with one of my other classes: International Relations 101, Logic 101, and Bargaining 101.