I am a self taught graphics programmer. I learnt path tracing/re learnt it and iterated it over and over many times. I had many gaps in my knowledge. I went back and back till time I find my self in position where I can teach someone. I meant to write blog posts someday but with my current workload it seems it will take time so I am sharing poor mans notes here and hoping someone will find it useful. I will release them in parts.