I looked through minecrafts source code, The version of minecraft I am coding is 1.21.11 and on fabric there are two “mappings” or interpretations of minecrafts source code. the first version is the community one called yarn which was the one that I was planning on using when I was watching a tutorial series on Youtube however the documentation uses the other mappings called the “mojang mappings”. I switched to the mojang mappings and looked through minecrafts source code using that. I figured out how to handle terrain generation, add new things to minecrafts registry system, and access player data. My next goal is to look through some real applications of mods and this is how I recommend others who are interested to do so to!