Comment by ploxiln

man pages start with the function prototypes, that's your "quick summary".

Near the end there can be an examples section, and many man pages have one. If I run "man 3 open" I see a reasonable examples section.

I like manpages because I'm already editing or running programs in the terminal, and I can pop open the man page in the terminal quite quickly and conveniently, without a search online or even a single network request, without reaching for the mouse, etc.