In case you haven't already, you might want to check out the McKusick courses (available as videos). They're not cheap though, maybe you can find pirated copies.

I was fortunate enough to see some back in the VHS days when someone in a local LUG convinced their employer to buy them as a way to support FreeBSD and give the team something to watch together (and recruit from the LUGs via hosted viewings no doubt).

https://www.mckusick.com/courses/

The few talks that are available from him online are quite interesting.

Thanks for the link.

I assume s/Evolution/Implementation/, it is a good book.

I have the 2nd edition of the book from 2014 both in paper back and in digital format.

It’s a nice book. I bought it years ago.

I haven’t finished reading it yet, as it is a lot of pages and quite heaving reading.

But I like it a lot. And I will continue to read it.

Yeah, typing from memory, so got it wrong.