There is no foundation for participating in VR development training, but it is best to have the following foundations:
Unity engine: 3D engine contains a lot of content. Let's get a general idea of how Unity makes games. You can look at some simple projects.
C++, C#: Most 3D engines are developed in C or C++, you just need to write the relevant code.
If you want to know about computer graphics and shader programming after understanding the above, you can do some projects for a period of time to appropriately strengthen the depth and breadth of knowledge.
VR development learning includes self-study and training. Self-study is more flexible and the cost is relatively low, but self-study needs a good understanding, and it is inevitable to take some detours when learning. VR development training is still necessary. It is a good idea to sign up for VR training institutions. If you want to save study time, you can choose regular professional VR training.
VR training involves a lot of knowledge, and the number of theoretical courses and practical courses required by different courses is different. The period for completing these courses is generally 4-6 months. VR training and learning cannot rely entirely on teachers. The important thing is to work hard by yourself. Communicate with teachers and classmates in time if you don't understand.
The above is to introduce you to what foundation you need to participate in VR development training, and I hope it will help you.