The reason I had crammed everything onto one cpp file was so that the tutorials could be completely focused on directx and so people wouldn't have to jump around between classes. I get mixed reviews on that though, some people like how its focused only on directx and no jumping around, other people want to know how to organize these things in an object oriented manner. I'm still debating on writing them this style or not for directx 12 tutorials. The problem is there are so many ways to organize the code, not everyone will agree with the way the code is organized, all programmers have their programming style.