I spent the early 70s and early 80s in Brazil. I left at around the time of the abertura in 1984 when we lost a semester at UnB due to the student and faculty strikes. It was convenient that my family was coming to the USA. There's a lot I missed while living in Brazil but I've enjoyed watching Peninha (Eduardo Bueno) explain Brazilian history on his "Buenas [sic] Ideias" YouTube channel.

He spends a lot of time on the 1960s and the "milicos escrotos" (f'in military folks) who took over at the time, but he's written a number of books on Brazilian history and has an entertaining style.