Slidology... https://www.amazon.com/slide-ology-Science-Creating-Presentations/dp/0596522347/ref=sr_1_6?ie=UTF8&qid=1513028896&sr=8-6&keywords=presentation Nancy Duarte did other books (e.g. Resonate). There is plenty of practical and good stuff in there. She also gives trainnigs and a lot of great leadership guys I met, had a Duarte training.
Think of it as two domains: what you and how you say it.
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What you say
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How you say it
There are entire companies that specialize in just that. Duarte is the legend. Check out the great book Slide:ology.
https://www.amazon.com/slide-ology-Science-Creating-Presentations/dp/0596522347/
Nancy Duarte has some excellent books on presentation / slide design:
Garr Reynolds' Presentation Zen has also been helpful:
To these I'd add something on presentation; this is a serious skill for UX practitioners and gets overlooked lots of times. Two really good books on ppt/slide presentation are "Slide:ology" and "Presentation Zen."