Gybing is when you turn a boat a certain way to change the direction it's heading.
Imagine you're in a little sailboat on a calm lake. You want to turn the boat to the left, but you can't just steer the wheel like a car. Instead, you have to move the sail to the other side of the boat.
First, you need to make sure the wind is coming from behind you (this is called being downwind). Then, you turn the boat's nose toward the wind, so the sail flaps a little bit.
Next, you let the sail out by moving it to the other side of the boat. This is where the tricky part comes in. You have to do it quickly, so the wind doesn't carry the sail away or push the boat over.
Once you move the sail to the other side, the wind will catch it and turn the boat in the opposite direction. This is called a gybe. If you do it right, you'll feel a rush of wind and the boat will start moving in the direction you want.
It might take a little practice to get the hang of gybing, but once you do, you'll be able to turn your boat in all kinds of different directions. Just remember to be safe, follow the rules of the water, and wear your lifejacket!