 So you don't understand brush radius, not a problem. This one's real simple. It just means it'll apply whatever action you picked to whatever area your brush is over. You can see how big the radius is with the red circle. So if we increase the radius, that's where the actions get applied. If we shrink the radius, the actions will only be applied to that smaller area. Nope, that helps. And as always, hope you have a fantastic day and I'll see you around.