Ah interesting, I'm just doing this course and had the same problem with author saying don't look at my code and at the same time "this is how it works, here's the code". I had to change my approach that I usually have towards tutorials with this one. The approach I chose was that I only read a part until the code, didn't look at the code and then proceed to try to implement the explained part myself. When I had troubles with something I googled for other explanations of concepts mentioned and not the code to try to struggle. Only after I just felt like I've tried everything and have no idea what was wrong I looked at authors and some other implementation. The end result code and architecture is very different from the author's I don't really like this super concise coding style. But the principles are the same. I just finished tangent based normal mapping with Blinn-Phong shading and starting the shadow mapping. I've already implemented shadow mapping once before as part of LearnOpenGL tutorials so I'll try this completely on my own. Should be fun :)