The controllers for the Quest 2 can be confusing at first. A simple way to determine the left from the right controller is that the left controller has a ‘Y’ and ‘X’ button, and the right controller has an ‘A’ and ‘B’ button.
The image on the right demonstrates how to grasp the controllers correctly. Be sure to slide the safety straps over each wrist and tighten them first, for your safety, and the safety of others.
For each controller, the grip switch should be facing your other hand, or inwards. Your index, or pointer finger, should rest on the trigger switch, at the front of the controller. Your middle finger should rest on the grip switch, and your thumbs should hover over the buttons within the dark grey circle. Your ring finger and little finger grasp the controller.