Sometimes, it can help to first run the user through the task and what they need to do in the training simulation. Often this is done by the trainer in a class room and then the students will practice executing the task in the VR simulation.
However, we can also have the training application run through the theory within the VR experience. The advantage of this is that students can do the course whenever they want and there is not need for the trainer to be physically present. It could also be done on a regular 2D screen experience, but creating this in VR allows the user to immediately inspect the objects being discussed and try the actions and interactions they will need to know once they start the full simulation,