This course offers a graduate-level introduction to topics at the interface of theoretical computer science and economics, with a focus on strategic and learning-based interactions. We will cover the basics of mechanism design, auctions, and pricing, as well as models of strategic behavior such as Nash equilibrium and the price of anarchy. Additional topics include learning in games, strategic classification, and dynamics in multi-agent systems. While COMPSCI 515 focuses on cooperation, social choice, and fair division, this course emphasizes competitive settings and mechanism design.