Re: Learning troff - where to start?

[Tadziu Hoffmann]

> 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?

The answer to both would be the Troff User's Manual, CSTR#54:

  https://www.troff.org/54.pdf