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To learn troff, you should first read this section. It provides a lot of information to help you understand Troff because the manual that describes troff is pretty dense and not very learner-oriented. After reading this section, you can refer to the Unix User's Supplementary Documents (USD) chapters 20 through 25 for additional information.
There are many different types of troff: nroff, troff, ditroff, psroff, groff, and others. They all use the same commands but print to different types of printers or have added features. Nroff is used when you want to print to a low resolution device like a lineprinter. Groff is the GNU implementation of troff, which is used at PSU, and is, thus, used in examples.
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