I’ve launched over a dozen products. Some absolutely crushed it. Some were weaker. One failed miserably. The bottom half of my products all had one thing in common. If you’ve been around the block a few times, you might be thinking, “Ahh, I know what Rob is talking about. Never build before you validate an idea.” This is not an email about validation. I mean, yes, getting some validation before you build is critical. It helps you avoid creating businesses that are doomed to flop. You can use...