I really miss BSD (I'm a Slacker so at least I get to be nostalgic about it, even if Slack and Linux in general is annoyingly "modern"). I would like to use it

I really miss BSD (I'm a Slacker so at least I get to be nostalgic about it, even if Slack and Linux in general is annoyingly "modern"). I would like to use it again, but I'm a afraid I'd miss out on the latest developments that happen only in Linux-land (I'm still pissed that containers are such a Linux-centric piece of tech when they in no way need to be).