[Groff] Macro packages

[trebol]

Hello all,
I’m  new  using groff.  Can anyone tell me a short introduc‐
tion to the ms, mm, me, mom macro packages? I would like  to
know  the opinion of someone who has used these packages for
all types of works (math,  literature,  ...).   I’m  reading
"Unix  text  processing", "Troff user manual" and the gtroff
reference in the groff’s info manual; and now I  would  like
to start using a macro package.  Can anyone help me?