Does anyone know a step by step explanation of how to implement the teleport feature in Unity?

This is such a highly requested feature but its one of the easiest things to implement on your own.
1) Get input from controller to prompt teleport sequence (ex: hold A button)
2) While button is down, raycast forward from the controller and return hit position
3) On button release, transform.position = raycast.hit.position;

The rest is just visuals.
More info about raycasting here https://learn.unity.com/tutorial/3d-physics#5c7f8528edbc2a002053b515

I'd highly recommend trying to learn this yourself, if you can get over these early roadblocks your abilities and skills will grow, instead of always relying on others :)