Okaam

So for example if I look at the vanilla code for the HUDs (which is roughly what I want to do), I'll be able to create one myself ? (With the help of the wiki and the forge documentation for the mod, of course) ?

Hi, I've been coding Spigot plugins for years and am now trying out modding with forge. The problem is : the only official documentation I could find is https://docs.minecraftforge.net/ which clearly doesn't describe every class and every function. Couldn't find JavaDoc to import either, so how do I know how I should use constructors or methods when the parameter names are p_11425_ or stuff like that ? I know there are lots of tutorials online but that's not how I learn my way into coding in general, and especially in Minecraft. Plus these people making the tutorials must've learnt the methods somewhere. As I said, I'm new to this, so I'm sorry if there are obvious answers which I didn't see, but trust me I've searched the Internet (the wrong way perhaps).