Install pdflatex on MacOS

Tex distributions

First step is to install a latex distribution, either basictex or mactex. If you want to be thrifty, go for basictex. But be prepared to install a lot of missing style files. Both ways can done via brew,

brew install --cask basictex

Installing missing style files

All of this is done via tlmgr. You can first update it,

sudo tlmgr update --self

Then, if you’re missing comment.sty when trying to compile a latex document, you’ll need to do

sudo tlmgr install comment

Notice that you always run tlmgr in sudo mode.

A last comment: I went with basictex. But if I had to do it again, I would install the full distribution so that I don’t have to install so many missing style files.

Ref: Getting started and productive with latex basictex on OSX terminal