How to I use the Hand Visual script in the Oculus Integration for Unity?
The Hand Visual script in the Oculus Integration for Unity is used to enable hand tracking and display virtual hands in your Unity project when using an Oculus device. 
Here are the steps to use the Hand Visual script in your Unity project:

1. Import the Oculus Integration package into your Unity project. You can download the package from the Oculus Developer website.

2. Create a new scene or open an existing one in which you want to enable hand tracking and display virtual hands.

3. Add the OVRCameraRig prefab to your scene. This prefab contains the components necessary for VR camera movement and tracking.

4. Add the OVRHandPrefab to your scene. This prefab contains the Hand Visual script and other components needed for hand tracking and visualization.

5. Select the OVRHandPrefab in the hierarchy and enable the Hand Visual script by checking the Enabled checkbox in the inspector.

6. You can customize the appearance of the virtual hands by adjusting the properties of the Hand Visual script. 
For example, you can change the hand model, adjust the size and position of the hands, and configure the hand tracking settings.

7. Play the scene and put on your Oculus headset. You should now be able to see and move your virtual hands in the Unity scene.

That's it! With the Hand Visual script enabled, you can now use your hands to interact with your Unity project in a more immersive way.

Let me know if there is anything else you need.
and how do I use it?
To use Hand Tracking on your Quest, you need to have the feature enabled. To see if it is, press the Oculus button on your right controller to open the menu. Select the clock icon on the left side of the menu to open the Quick Settings panel.

On this panel, choose Settings to open the full options menu. Then go to Device > Hands and Controllers. Here, under Hands, make sure Hand Tracking is on.

If you leave the Auto Switch setting on, your Quest will automatically decide to use your hands or controllers for input. When you put the controllers down, it will use your hands. Then when you pick a controller back up, it will switch to those again.