FreeBSD and OpenBSD are interesting.
I am interested in BSDs as macOS's Darwin kernel is derived from BSD and I want to understand it more as its my main OS.
What are the differences between OpenBSD and Linux? (2019) (HN)
HardenedBSD - Security-focused and hardened FreeBSD derivative.
What I think what we need to do to keep FreeBSD relevant (2019) (HN)
FreeBSD is an amazing operating system (2020) (HN)
Tale of OpenBSD secure memory allocator internals - malloc(3)
Technical reasons to choose FreeBSD over GNU/Linux (2020) (Lobsters) (HN)
My new FreeBSD Laptop: Dell Latitude 7390 (2020)
tilde.institute - Public-access OpenBSD system.
Guide to FreeBSD Desktop Distributions
HN: FreeBSD 11.4 (2020)
NetBSD Internals (HN)
Tutorial sites treating FreeBSD like a Linux distro (2020) (HN)