Help with Triggers

There are different ways to approach that. You could use states, layers, or a combination. 

Here's one approach: 

• Give each bullet/button three states: Normal (just the bullet), Selected (bullet + label text + some kind of highlighting), and Visited (bullet + label text). 
• Put the buttons into a button set. That will automatically change a button to Selected when it is clicked, then change it to Visited when another button is Selected. (Here's more info: https://community.articulate.com/series/articulate-storyline-360/articles/articulate-storyline-360-user-guide-how-to-work-with-button-sets 
• Put each example on its own layer.
• Add a trigger to the each button that shows the corresponding layer. 
  • FYI: By default, Slide Layer Properties are set to hide other layers when a layer opens. So the previous example will automatically disappear/close when another button is clicked.