Disinformation in the Brazilian Amazon communication ecosystem is widespread. On October 25, the Internews Rooted in Trust team held a virtual public class to shed light on this very subject and learn from past experiences and practices. The event featured experts who fight disinformation in Brazil, especially in the Brazilian Amazon region. The goal was for them to share with viewers, and with each other, their daily experiences in doing this work, including the challenges, lessons and methodologies they use. This open source class was intended to encourage debate, learning and to stimulate new practices to combat disinformation among different actors in the states of Roraima, Amapá and Pará.