This is the Slide Animations setting you normally see for a PowerPoint presentation.  The presenter usually just clicks somewhere on the slide to advance to the next slide. To  begin to create a non-linear presentation where you will add buttons and/or hyperlinks to create the navigation, you would uncheck the On Mouse Click checkbox.

Here you see a Title slide with this setting unchecked. All the other slides also have this setting unchecked.

Notice that a Begin button has been added to the slide. This is just a Rounded Rectangle.  Below you see the Hyperlink setting for this button.

This is a Menu slide where you can see that there are hyperlinks to various parts of the presentation. Each of these have been set up like the Begin button on the Title slide.

This slide illustrates how you can set up a simple show/hide interactivity by using Object Animations. By applying an Entrance Animation (Faded Zoom) to the image of the cabin (Picture 3) and the text (Text Placeholder 8) about the yacht, those two objects are initially hidden.

The learner is provided instructions to click the picture of the yacht (Picture 2).

This is the Timing tab of one of the Entrance animations (Faded Zoom) showing how you assign the first click of the picture of the yacht as the trigger to "show" the object.

This is the Timing tab of one of the Exit animations (Spinner) showing how you assign the second click of the picture of the yacht as the trigger to "hide" the object.

You can use the above method to have several show/hide interactivities on a single slide but you may find that the slide will get very crowded.

Here you see another slide with three "hotspots", the red ovals.

Each of the white ovals have a hyperlink assigned that links to another slide that is a duplicate of this slide with slight changes (such as the instructional text) with the duplicate slide containing the "popup" information.

This is the duplicate slide to accompany the hotspot for Athens. The intent here is to show text and an image of one of the most important sites in Athens, Greece. Each of the two objects has an Entrance Faded Zoom Animation set up to be triggered when the slide is viewed, thus simulating a "popup" effect. The slide is set up to advance on click.

In order to have an Exit Animation, another duplicate of the slide is created, with this one being set up to automatically advance after 0:00 seconds. Shown to the right are the Exit Animations (Spinner). With this copy of the slide, the instructions do not appear since the slide is set up to automatically advance.

Now, to make this work, a Custom Slide Show has been set up. This is a very powerful, yet often overlooked feature in PowerPoint.