Pre-selling/marketing advice

Hello all,

Has anyone had success marketing a product (software, physical product, etc.) before actually creating said product? If so, are there any do's and don'ts that should be followed?

Here's why I ask:

I have narrowed down my ideas into one executable SaaS concept. It is in a market that has relatively low competition, but could be used by many people. It meets the criteria of offering value to a large audience. More importantly this product offers a value skew to an already...

Pre-selling/marketing advice

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