Following Jean Luc Doumont's simple advice on creating powerpoints has dramatically helped me create more effective presentations that hold people's attention. I highly recommend his book [1] and presentations [2] on reducing noise in slides to maximize the effectiveness of key-takeaways.

[1] https://www.youtube.com/watch?v=meBXuTIPJQk [2] http://www.treesmapsandtheorems.com/