Scott Nesbitt has an informative post on how to set up and use Reveal.js and Org-reveal for generating slide decks. There are several solutions for making slides that leverage Emacs and Org mode but Org-reveal is the simplest that I’ve seen. If you’re giving talks all the time, you should at least look at Beamer and it’s org interface but if you only occasionally need to generate slides and you’re looking for a simple, quick-start method, Org-reveal is just what you need.
Nesbitt’s post tells you how to install Reveal.js and Org-reveal. Note, though, that if you’re using ELPA, the name of the package is “ox-reveal” not “org-reveal.”
Once you’ve gotten Reveal.js and Org-reveal loaded, making a slide deck is simply at matter of writing an Org outline, where each headline corresponds to a slide. You can make subsidiary slides by using sub-headlines as described in the Org-reveal README on GitHub.
Nesbitt’s post shows you how to control the look of the slides and choose the transition technique. He also shows you how to include images. Check out the README for more detailed information such as how to include Mathematics, give slides headers, footers, and numbers, and a few other “advanced” techniques.
If you’re giving that talk tomorrow and don’t have time to waste, Nesbitt’s post will tell you all you need to know. If you have a bit more time, the README file in the Org-reveal repository will show you how to spruce the slides up.