Learning troff - where to start?

[Johann Höchtl]

Hi,

I am just a casual dabbler who is somehow fascinated by text processing


I am using neatroff - It seems to be the most actively developed and has 
some nice modern features like paragraph-at-once formatting and utf8 
support out of the box.


Having said that, it seems that all troff implementations like plan9 
troff or groff itself, seem to have no canonical, "all-encontained" 
documentation. All seems to derive from .. ?


So my question is:

* What would be a good starting point (tutorial) into troff and its core 
principles?

* What is the canonical documentation of troff all the existing 
implementations seem to derive from and describe their deltas in their 
respective documentation?


Thank you!