How do you know if you're approaching product-market fit?

The answer is if more than 40% of your users be "very disapppointed" if they could no longer use your product.

If you are above the 40% benchmark, you have reached product-market fit and are ready to scale.

Sean Ellis of Dropbox

I will complete research & analysis.

this is a marketing article. From reality perspective, only 10% true.

Hi Azmat! Could you help me understand what you mean with "this is a marketing article" and "From reality perspective, only 10% true".

I really want to understand what flaws there might be in my thinking. If you could help point out the flaws you see in this article, I'd really appreciate it! :)