Berkeley's Unix built the internet's networking stack, invented the tools every admin still uses, and was frozen at its peak by a lawsuit that handed the PC era to Linux. Then it quietly conquered anyway — inside macOS, every PlayStation, and the servers that stream half the internet. This is how.
Openbsd
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The Story of BSD: The Unix That Lost the War and Won the World -
FreeBSD and OpenBSD for the Linux Admin The BSDs for engineers who only know Linux. The single biggest mental shift — a unified base system versus the distro model — then FreeBSD's jails (the original containers), the bhyve hypervisor, native ZFS, and the ports/pkg world; OpenBSD's security pedigree (pledge, unveil, W^X, secure-by-default) and pf, the cleanest firewall syntax in existence. Where a BSD still beats Linux for routers, firewalls, and storage appliances — and the honest places it does not.