Some people have had trouble with the slides because they use a font (Roboto) that’s not commonly installed. The slides have been revised to use embedded fonts, so you can edit or use them without everything getting pushed around.
In addition, both slides and handout have been revised to use pin 18 for the button instead of 17. That makes it easy for middle school students and below to do an assignment that involves the button controlling the LED.
Slides, handout, and the latest workshop image are here: https://ccse.kennesaw.edu/outreach/raspberrypi/resources.php