thanks! If you want to learn there are a lots of useful resources online. I actually followed a course on Udemy, very well done. That's a good place where to start with Unity + Google Cardboard. I think google cardboard is good to start if you want to learn about making games for VR. You don't need to invest a lot of money in it, few dollars and you are good to go. Going forward you can the try other platform such as Daydream, Oculus and so on.