You have to install some things, poke around the system, do some general management, etc... I'm not claiming to be an expert but I really liked what I saw especially in the documentation (it looks outdated but the content is absolutely on point)
>it looks outdated but on point
Which is it? It would be difficult for documentation to be both complete and incomplete.
I think he/she meant that the FreeBSD documentation is complete, although the styling of the site is somewhat dated.