Public speech (shaky)

Greetings to all! I registered on this forum in hope to get some help/tips on how to behave. The thing is that next week I am to read a speech at the exhibition I am taking part in. The topic is not difficult, it's about how Android versions were evolving throughout the years and what is the advantage of each new of the version. But I am scared of public speeches.... Besides I am scared of questions people will be asking. Could you advise me what I should pay my closest attention to?

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