In addition to using the 'man' command at the terminal for help with commands, syntax, qualifiers etc., I offer this other, hopefully helpful, qualifier to 'man'.
#man -k
The -k qualifier is used to search all short descriptions and manual page names for a keyword. And then prints out any matches.
Example. Say you're looking for help on something to do with rpm but you're not sure exactly which 'man' page would be applicable.
You would enter #man -k rpm
Which would then return all the 'man' pages having to do with the rpm package manager.
I find the -k qualifier handy when looking for a man page I'm sure exists but not sure of its exact spelling.
Hope this is helpful. To someone anyway!!