This course is about differential equations, and covers material that all engineers should know. There are 56 short lecture videos, with a few simple problems to solve after each lecture. After each topic, there is a short practice quiz. Solutions to the problems and practice quizzes can be found in instructor-provided lecture notes. There are six weeks to the course, and at the end of each week there is an assessed quiz. This course covers both basic theory and applications. In the first five weeks we learn about ordinary differential equations, and in the last week we solve the diffusion equation, which is a partial differential equation.