This!!! I have started many "side projects" with the notion that once I build it I will then find customers etc. This is terrible thinking and most of the times

This!!! I have started many "side projects" with the notion that once I build it I will then find customers etc. This is terrible thinking and most of the times lead me to think my idea is horrible, when in reality I have done nothing in terms of marketing. So yes I fully agree with start marketing the day you start coding. When I started https://mattebot.co/ https://mattebot.co/ I made sure to make marketing a top priority for products I release in the future.