The FreeBSD: Developers' Handbook, Architecture Handbook, The Porter's Handbook

[Tero Mäntyvaara]

Because I have no earlier experience from BSD and I am interested in
developing DF, I am looking for source code level documentation (a lot
of code examples).

As FreeBSD, NetBSD, OpenBSD and DF are somehow related together, I found
that FreeBSD has nice books The FreeBSD Developers' The FreeBSD
Handbook, Architecture Handbook and The Porter's Handbook. Could I use
these books as a base, as jumping in to space of code of DF? What should
I take into consideration that is different to DF?

-- 
Tero Mäntyvaara