apmd
Worth mentioning that OpenBSD 7.1 includes a change in the apmd power management software so that when plugged into the mains, a laptop will tend to run at maximum processor speed. See
https://dataswamp.org/~solene/2022-04-21-openbsd-71-fan-noise-temperature.html
for references and a user space daemon to provide sane defaults.
The multi-slice default automatic disk partitioning is apparently something to do with write XOR execute permissions on various slices, see
https://undeadly.org/cgi?action=article&sid=20160527203200
I'm always impressed by the documentation *within* an OpenBSD install. The FAQ and man pages for the base system are also available from openbsd.org. Reading
https://www.openbsd.org/faq/faq1.html#OtherUnixes
might help with the initial orientation.
The 'learn once' comment above rings true to to me, similar to Slackware in the Linux world.