Demo: tell, show, tell
Three things, each tied to a pain the buyer named.
The goal of a demo is a buyer who starts picturing the product in her own week. "Can you do that on our own data?" is the question you want, not applause.
The core move is three beats: tell the buyer what you are about to show, in their words; show it briefly; tell them what it means in their number. Then ask a short question. Show about three things, not thirty. Rule zero: no demo before discovery, because discovery gives you the words, numbers and names the demo is made of.
Find your way around
Learn it in the course, copy it from a playbook, see it work in a case study.