If you’re interested in seriously learning troff, I’d like to double down on the recommendation in the article: Take an afternoon or two to read at least the troff parts of UNIX Text Processing, available for the low cost of free these days.
The book is a good read, the plan9 troff tutorial is also helpful.
The original gopher link: gopher://sdf.org/0/users/dbucklin/posts/gopher_groff.txt
I love seeing gopher content shared on lobste.rs but it’s a shame when the original links are left off. Is it possible to share direct gopher links in submitted stories? I’m guessing not.