Sales is this cure all for this problem. Get people to give you their credit card and I guarantee you they're actually interested.

Who would you talk to? That is the first question for almost any startup that you need to answer. Who is my user and where am I going to find them?

Users think they know what they want, but you get the horseless carriage effect where you're getting asked for a faster horse.

The other mistake I think people make is talking to who's available rather than talking to who they need to talk to.

The Twitch community loves watching video games, chatting, and broadcasting. The average viewer watches over an hour and a half of video each day. Over two-thirds of our logged-in users chat each day.

The pool of people you care about is going to shift over time.

Recording interviews is like magic. a) It stops you from taking notes in the middle and b) you can play that recording for people.