A teacher has two fundamental roles: first, to explain the concepts in a way that is accessible to a given person, and second, to check if they actually underst

A teacher has two fundamental roles: first, to explain the concepts in a way that is accessible to a given person, and second, to check if they actually understood. As for 1), there are so many resources to choose from and everybody has their favorites. But 2) is crucial, so today I tend to choose resources with exercises AND answers/key/solutions so that I can verify if I understood the material correctly myself. There are also online books with solutions integrated, such as[0]. [0] http://linear.ups.edu/fcla/section-WILA.html http://linear.ups.edu/fcla/section-WILA.html