What resources would be a good primer on the OpenBSD kernel and general architecture and give me a good understanding of the internals?
FreeBSD has this: https://docs-legacy.freebsd.org/doc/13.0-RELEASE/usr/local/share/doc/freebsd/en_US.ISO8859-1/books/arch-handbook/book.html I understand that in OpenBSD there is the mantra that source code is documentation. But as a beginner I'm afraid that I do need something explicit that would allow me read the source code in an effective manner.