[kjksf]

I second "Mom Test Book" (you can watch author's YouTube talks that cover the topic https://blog.kowalczyk.info/article/06817da6d15d429db3eec8f2...).

The thing is that most people think that idea validation is "Hey, this is my idea, what do you think?"

"Mom Test Book" describes a way to discover valid ideas by asking question, not asking question to validate ideas you had by yourself.

Still not easy by this point of view changed the way I think about it forever.

And now I can't help and see how everyone is doing it wrong i.e. instead of discovering ideas people would be willing to pay for, they have ideas and then look for validation (if that).