Definition
Golfers refer to their "go-to shot" as the type of shot they are most comfortable hitting, especially when they are a bit nervous. Typically, this is used for tee shots to get the ball in play. For example, my "go-to shot" is a fade. I'll always try to hit a fade when the pressure is on.
Usage
When you're under pressure, you'll need a go-to shot that you are comfortable with.