h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

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Sorry, I went to that website and found the writing to be funny. English is apparently not the first language of those who constructed the site.

Say what you're going to say, say it, then say what you've said, job done! Best of luck.

That's a good summary.

If you want to get into it more, there are Aristotelian guidelines for rhetoric. But you don't really need them.

Granted, though, if you're trying to talk a client into doing business with you, it might help to know where to put your strongest arguments, when to concede the obvious weakest ones, and leave yourself some leeway if further concessions are needed.

There is also something called an "elevator speech," which should be super short, as if you had to interest those around you in the short time between floors. People who perfect this technique are apt to be in demand.