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LeedsFrontEnd - Pick a topic you care about or are interested in learning about. It'll make writing the talk easier - Don't think "everyone knows this already", loads of people won't. Even for the people that do know what you're talking about, you have your own take.
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LeedsFrontEnd - Build a narrative into your talk, it'll make it flow better and keep your audience engaged - Unless you can code without making mistakes, and can perfectly explain what you're doing while you're coding, avoid live coding. It's way too easy to lose your audience
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LeedsFrontEnd - Live demos will ALWAYS go wrong. If you absolutely must do one, have a video or something as a backup.