It says "Please note that this page is out-of-date. For a more detailed and up-to-date guide to HardenedBSD's features, please visit our wiki." at the bottom.

It says "Please note that this page is out-of-date. For a more detailed and up-to-date guide to HardenedBSD's features, please visit our wiki." at the bottom. So I tried that. I'm guessing that "sysctl hardening" is https://git.hardenedbsd.org/hardenedbsd/HardenedBSD/-/wikis/home#modified-sysctl-nodes https://git.hardenedbsd.org/hardenedbsd/HardenedBSD/-/wikis/... There's no clue on the wiki what "boot hardening" is, though.