“There’s no one right way to validate a startup idea. And, even if you do it perfectly, it doesn’t guarantee success. But it does hugely reduce the risk of failure.”
There are some links about the very popular Mom Test book that helps ask better questions when testing your startup idea.
“The Mom Test is a book that helps you speak to your customers in a way in which they can’t lie to you, subconsciously or otherwise. By talking about their life, and the problems they face around your area of interest, INSTEAD of your solution, you get an unfiltered, unbiased set of feedback about what they REALLY want to have solved.”