Moving MVC 5 Views to jsx(React)

Question

I am new to react. Currently my application is  on .Net MVC. I want to move my views(frontend) to react. I saw many example, but none of them are clear and most of them are with hello world. My views has bootstarp classes style and attached to a model. so I want a complete and clear example of moving views with all these feature to react. Also is it possible to use my controller methods in new react functionality?

We are moving to .NET5 and React, but this application is used by many users, so I don't want to disturb existing functionality and trying to move this application step by step to React. So is this possible that I can move in hybrid manner?