[atrus]

What are some good resources to learn this?

[mandmandam]

I'm interested in developing in this area as well, but I can say for sure that "The Mom Test" is basically an essential read.

[soogwoog]

Unfortunately, experience. A good dose of people skills help, but you need to know what makes real money move and get contacts in your area. Find someone who has succeeded in your area, and try to get into those circles.