This is a free, open source course on fitting, visualizing, understanding, and predicting from Generalized Additive Models. It's made possible by a long and fruitful collaboration in teaching this material with David Miller, Gavin L. Simpson, Eric J. Pedersen, by Ines Montani who designed the web framework, and by Florencia D'Andrea who helped build the site.
Contributions and comments on how to improve the course are welcome! Please file an issue or feel free to submit a pull request if you find something that could be fixed or improved.