Before being tech people, they are just people.
I had already failed the wrong way: having an idea, spending money and time creating a product and then watching it failing miserably.
The huge difference between interest and paying customers (and a validated product) presented in the “get fit” analogy.
Startup lessons from Neil Patel‘s mistakes, founder of KISSmetrics, Quick Sprout, Crazy Egg and other less known (and failed) startups.
A one page summary of Rich Dad, Poor Dad (not an actual summary, but the important bits and lessons I memorized).