There are different types of items you can add, depending on what you want to present. Here is a list of the items:
This is the most common, and it is for adding text to a slide, or just a general shape.
This is for adding images or videos to your slide.
This is for adding a timer to your slide, that can be controlled from "Timers" in the drawer.
This is for adding an SVG icon to your slide.
This is for adding a "link" to another shows item, can be used for showing multiple versions of a song/scripture in the same show.