How do you make two columns or parallel text in pdf?

Hi, and welcome!

Please see the FAQ: What's a reproducible example (`reprex`) and how do I do one? Using a reprex, complete with representative data will attract quicker and more answers.

This S/O post may be helpful. It takes advantage of features in a slide presentation template. I've done this with a combination of xtable, Haskell and \LaTeX, but that's not for the fainthearted (it took me a few weeks).