Working through the Thinking with Types book by Sandy Maguire. The book can be purchased at https://leanpub.com/thinking-with-types (e-book) or http://www.lulu.com/shop/sandy-maguire/thinking-with-types/hardcover/product-23922949.html (physical copy). I receive no financial benefit if you purchase a copy.
Progress on the book is being live streamed on https://twitch.tv/chiroptical. All of the videos will be archived on YouTube at https://www.youtube.com/playlist?list=PLW_sOzxD_4gQok1m4uH05zI993SV-uXsI