These teaching notes introduce the Neoclassical Growth Model (Ramsey–Cass–Koopmans) in discrete and continuous time. I started writing them because I felt there was a shortage of materials that explain the model in a way that is easy for undergraduate students to follow, while still filling in the important steps and tying up loose ends. The notes assume only a basic knowledge of calculus, but they may also be useful for graduate-level courses. They also offer some fresh perspectives on parts of the Ramsey model, including a heuristic argument for the existence and uniqueness of the equilibrium path using the phase diagram, and a differential-equation approach to moving from discrete to continuous time.