I would like to add a few more tips, based in my experience in an academic background:
Don’t go back in the presentation to refer to something. If you want to refer to a slide/graphic you already explained, you put the slide/graphic once again, but do not go back several slides.
Use big fonts. Text should be clearly readable in any part of the room you are presenting.
References and sources should be put as a footnote in each slide, not as a big ass slide at the end of the presentation.
Enumerate your slides.
Time and flow quality is just as important -or maybe more- than the visual quality. It is a must to stay behind a 10% error margin of the alocated time. So in a 10 minutes presentation, always stay between 9 and 11 minutes (ideally between 9:30 and 10).