@b0rk it's an uncool example these days but...

i always really appreciated how `man perl` links to 40+ other man pages that collectively describe the entire language and its standard library and tools. so if you are trying to learn about it everything you need is there and can be browsed or searched for. the prose is fairly engaging and well-written.

(these days online might make more sense but at the time having it available offline in a very lightweight format that was readable from the terminal was great.)

P.S. the manual pages are actually produced by perldoc which is also a very cool related tool.