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Yay! David Spivak and Brendan Fong are teaching a course on applied category theory based on their book, and the lectures are on YouTube!
Their book is free here:
If you're in Boston you can actually go to the course. It's at MIT January 14 - Feb 1, Monday-Friday, 14:00-15:00 in room 4-237.
They taught it last year too, and last year's YouTube videos are on the same YouTube channel.