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I believe this line https://github.com/rockthejvm/cats-effect/blob/master/src/main/scala/com/rockthejvm/part2effects/IOIntroduction.scala#L108 should read:

if (n <= 2) IO(1)

Otherwise, in the video, it says fibonacci(10) is 89 when it's 55. I would have asked in the Slack channel, but I lost the original email 😭, and also I get a 403 when pushing up a local branch for a pull request.

In the IO Exercises section around 22:20, Daniel states that: this time it is essential we wrap the recursive fibonacci call in an IO to prevent a stack overflow. However, this worked fine in the previous sumIO exercise without such a technique being needed.

Also, the fibonacci solution seems to work just fine without the extra IO wrap... although it is so computationally intensive maybe we never get to a stack overflow anyway.

In the trait MyGenSpawn
you wrote the function def start[A](fa: F[A]): F[Fiber[F, Throwable, A]] but actually it should be
def start[A](fa: F[A]): F[Fiber[F, E, A]]