LaTeX is a document typesetting system that can produce attractive articles, books, and slides. It is especially useful when writing documents that have a lot of mathematical notation.
This guide has a basic lesson on using LaTeX, how to create a LaTeX document, and examples (see other tabs). Other tutorials and workshops are listed below.
First, either install a TeX distribution on your computer or choose an online system to use. Penn State Teaching and Learning with Technology also have many TeX programs installed in campus computer labs. If you choose to install a TeX distribution, the exact one will vary based on your operating system.
There are websites that allow one to work on LaTeX documents collaboratively, much like Google Docs. They also keep the files on their servers, so you can access them from any computer. All have free and paid plans. If you know of any other sites, please feel free to send me an email.