This article is written by a person that has never worked for a startup. First of all, the startup's idea needs to be original so that it can work. Secondly, you need a lot of planning, and the most challenging thing is finding some investors or getting grants. Well, now it is not so hard to find investors, because there are such services like innovation-park.eu that can help you with it. But it doesn't mean that you will find them in a couple of days because investors are attracted only by good ideas and good business plans.
_________________________
https://innovation-park.eu/

It is not very good. Why do people still use kerosene lanterns when LEDs have been around for a long time?

It's not that easy.