Lecture 1: Introduction to the class; overview of topics and problems considered
Page 6: Polyhedra: edge unfolding, general unfolding, vertex unfolding, folding into convex polyhedra, reconstruction
For two examples of folding polygons into polyhedra, you can look at all possible gluings of the square, and at the Metamorphosis of the Cube video, which in particular shows different gluings of the standard cross unfolding of the cube.
These are rough, personal lecture notes handwritten by Erik Demaine used during lecture. Their primary purpose is for reading/review by students of the class.