There are only 4 things you really need to be good at public speaking.
1) if using notes, keep them as short as possible. No crib reading. This allows you to make eye contact.
2) stick to the bl**dy point – if you don’t, your audience will be thinking this precise sentence
3) don’t rush – as much as it isn’t a marathon, nor is it a sprint.
4) lick your teeth – this lets you make consonants more easily, making you clearer to listen to. More consonant (plosive, sibilant, et c.) sounds than assonant in most languages.
Occasioned by seeing someone reading a crap book about public speaking.