While this is a decent set of tips for design, the important thing to remember if you are actually giving a talk is that you are the presentation, not your slides.
Edit: That said, the right visual aids can be important for delivering a powerful message. I found this pretty useful in terms of making great looking slides that will actually help your talk by highlighting key points and keeping people's attention.
> the important thing to remember if you are actually giving a talk is that you are the presentation
I spoke with a "speaking coach" once and this was precisely his advice.
At the time, I was giving him a mock presentation in a small room and I was using a laser-pointer.
He told me "Unless you absolutely have to, NEVER use a laser-pointer. YOU are the presentation. If you have to point out a specific section of your slide, walk up to it and SMACK it with your hand. Then get back to communicating with your audience."
Imagine if he had preceded his visual aids with a couple dozen boards of charts and bullet points, and shrunk the pictures down to quarter size to make room for blocks of text explaining what he was about to say.
Visual aids are great. Projecting the text of your speech on the wall, not so much.
Well, those recommendations make it impossible for you to just read whatever it says on the slide to give the presentation so in a way they are also about the content of your presentation.
True, but even if the right visual aids can help you, the wrong ones can make your presentation terrible, this is where I think this presentation also helps.
Edit: That said, the right visual aids can be important for delivering a powerful message. I found this pretty useful in terms of making great looking slides that will actually help your talk by highlighting key points and keeping people's attention.