Before diving into OpenGL in earnest, this guide explains settings, variables, and internal structures in a detailed, kind, and easy-to-understand manner. The provided code is not difficult, and because of its simplicity, it is easy to modify the code to create your own framework (?) to apply to examples in future series. The best part is the emphasis on the graphics pipeline; it doesn't just show the results of the provided examples, but uses diagrams and explanations to easily teach how the results are constructed through each stage of the pipeline. I am looking forward to the next part.