My colleague Dave Rubenson outlines the sins of scientist presenters and gives advice on how to improve scientific presentations.
For me the key point is this:
Realize that a slide presentation is not a journal article. Slide presentations can stimulate important questions, inspire collaborations, and encourage audiences to read your journal article. They cannot achieve the same level of proof. Complicated and incomprehensible slides may create an illusion of proof, but only that.
Opinion: How to Give Better Talks | The Scientist Magazine®.