Many of the C++ tutorials are outdated and might not be working correctly anymore. They are more for giving people a general idea of how things work in Leadwerks. Many things like rendering are now easier because of the use of Framework. You can still do it the old by making world and buffers your self, but it for most people it is easier to use framework as there are so many features in it that cover complex code (godrays, anisotropic filtering, buffer rendering, water etc.)
Welcome back btw