Good book or course on goroutines

I am trying to go deep into the concurrency and parallelism side of Go, but most the books I have they just scratch the surface. I really want to fully understand the mystery behind the go routines, the channels, the waitgroup and the mituxes. Do you have any good resource on that?

I like this video

Go 101 - https://go101.org/article/101.html

The relevant chapter would be this:

https://go101.org/article/control-flows-more.html