In Linux, to get help or to read the documentation on a particular command we can use either of the three ways: man, info or pinfo .
The help command man is more popular and gives concise documentation of how to use a command, whereas the info or pinfo is the GNU documentation which is more detailed.
I personally liked pinfo the most, maybe because I come from a Windows background, but I guess I will use man more 😀
To get help with any of these documentation commands, just write the documentation command followed by the command with which you need help. Example:
man date
or
pinfo date
or
info date