Some time ago I made a presentation about LaTeX to a freshmen class. I prepared the slides using the beamer document class and the help of the wiki2beamer markdown syntax.
The whole project is freely available on Github. If you're new to LaTeX, there are plenty of information here to get you started. Even in case you're an expert, have at look at it and, especially, the source code. In case you find it useful, help spread it to the next generation.
The whole project is made available under the GNU General Public License 3.0, that gives you full access to use and modify the source code as you see fit. Or just have a look at the pdf presentation.