Help with triggers/variables: What am I doing wrong?

Ron is correct for points 1 and 2, but I think he is misreading when you change the variable in point 3. If you are setting that variable on the last slide of the "What is" section  (which is the best way to ensure that the user views all the information), then you do need the variables. The visited state is handy for visiting layers on the same slide, but not always reliable for visiting other sections. Your idea to use completed instead of the visited state is spot on.

The reason "When variable changes" isn't working is that it is changing on the "What is" slide, so is not observable to the Home slide.