Early on in my career as an Instructional Designer I used to work for AT&T and my job was to help their instructors create better courses. Most of the instructors came up from the ranks and were assigned the role of trainer because they were so good at their job that their bosses thought they’d be equally good at teaching others.
Presentations are all about communication and visual communication is one of the major ways we receive that information. In the culinary world there’s a saying “We eat with our eyes first”. And it’s the same with presentations. Your PowerPoint slides need to capture the viewers’ attention with clean consistent slides that engage them visually so they stay attentive until they have received your message and call to action.