The books don't tell you what's missing from your own talk. They give you general information about speakers in general.
Books don't tell you what's even more important than all the technique in the world.
What makes your talk work is something else.
It's how much you trust yourself.
As long as your life depends on getting approval from others, it doesn't matter how well you speak and how great your visuals are.
How much do you trust your own message? That's the only presentation that really works.
