This applies to all manner of things.
You may notice that speakers who talk to the screen are unengaging. So avoid doing that.
You may notice that strong speakers have a moment near the beginning when they grab the attention of the audience, and that this makes it easy to stay awake for the whole talk. So try to find a way to do that -- a way that fits with your own work, of course.
You will certainly notice that talks that go overtime make for a terrible experience for everybody. So don't do that. (You'll need strategies. The simplest is to have "landing points" in the talk, so that if you see that time is running short, you can skip some material to get to a landing point. Obviously, the conclusions slide ought to be a landing point.)
And so on. Learn from the impression that other speakers make on you.