Assuming you need to replace a brake light/tail light on your 2020 Chevy Traverse:
1. Open the trunk of your car. There are two screws on the sides of the taillight assembly that you will need to remove.
2. Pull the taillight assembly out far enough so that you can reach the back of it and disconnect the wiring harness.
3. Take out the old bulb and insert a new one into the socket, being careful not to touch the glass with your fingers (this will cause it to burn out prematurely).
4. Reconnect the wiring harness and screw in the two retaining screws.