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 copie

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