I try to title/abstract a talk so that the information someone needs to decide if it is interesting to them is present both before and during the event.
The other tip I've learnt is that pictures are often better than words in conveying complex info. Which is a pity because pictures are harder to do (at least for me). And there is no substitute for practice in become good at presenting. Watching video of yourself is also informative, because you can see how much you 'erm' and gabble and fidget (all things to be minimised).
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