The classic version of training is lectures, seminars, various videos, and so on. But I would note that many companies have now begun to implement the use of VR technologies. This allows employees to learn in an immersive environment where they can practice skills and solve problems. For this purpose, there are specialists in comprehensive VR services. For example, the well-known company Virtual Reality Experiences offers its equipment for rent https://www.virtualrealityexp.co.uk/vr-hire/, and also accompanies its clients at every stage of work. And virtual reality is used not only for personnel training, but also in many other industries.