Who is credible and who is not

Shane Parrish interviewing Gary Klein in The Knowledge Project Podcast, #144:

How do we identify the difference between people who know what they’re talking about and not? And to this point, one of the most important decisions I think that we make, and we don’t even recognize that we’re making a decision, is who we listen to and who we decide is credible and who we decide is not credible. And we don’t recognize that we’re making a decision in that moment, but how do we sort out who is credible and who's not? Or who knows what're about, or who’s faking it?