The design of the Quantum Field Theory (QFT) course is to divide it to QFT I and QFT II with one semester each. QFT I is offer in the Fall. Its aim is to make students learn how to do tree level calculations with some emphasis on applications in particle physics. Students can then take Particle Physics which is offer in the Spring to taste the full power of the standard model. Also in the Spring, QFT II is offered. The primary aim is to make students learn how to perform loop calculations and be able to appreciate the powerful machinery of renormalization. We will mainly use the real scalar field theory to do it, so even you have not taken QFT I or you are not familiar with the standard model of particle physics, you can still take it. Applications in condensed matter physics will be added in QFT II. We will largely follow Tony Zee's book. So it is a course suitable not only for students interested in particle physics but condensed matter physics as well.