There are various editors and working environments for LaTeX on Mac.

First, make sure you have the most recent MacTeX distribution installed.

You can of course just work with a plain editor and the command line, but there are nicer tools available for the Mac.
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Tags: Latex, Mac, Texshop, TeXnicle, TeXworks, Scribo, Latexian, BibDesk, LaTeXiT, LyX, Skim