A sales person usually has no much time to convince your customers. Yes, you might have 10 years experience, but even you fast-forward, I doubt your customers has enough time to listen to all of them!
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Travel guide business
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Email hosting business
Your email will be marked as Spam you don’t have a Reverse DNS setup
Web design business
It improves ranking in search engines revise your meta tags
You can write a lot, but your client may not have time for it. Remember, keep it short.
Solve the problem, not to show off your technical knowledge!