You need to create quality content to effectively communicate the subject matter. There are no set rules to prepare slides. Everybody comes up with their own or copy from their peers without giving much thought to how the content would look from the receiving end. Yes, it should go without saying that you create content that the audience can follow rather than a presentation which is comfortable for you to present.

By the time you create content, you would have got a handle on the objectives you have to achieve and would have a good idea of who your audience is. So creating content with these two pillar stones in place is like including the necessary nutrients and removing the flab from the meat. And do it from the perspective of the audience—meaning a logical flow that the audience are able to follow and connect the dots.