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These are some good resources: https://www.mcjty.eu/docs/intro https://forge.gemwire.uk/wiki/Main_Page Mostly people learn by looking at vanilla code, I think. The parameter names are a bit weird, but they're usually accompanied by a type - e.g., int p_282557_ (so we know this parameter is an integer) - when you trace the parameter back to where it is first declared in a method/class.

outside of registration class, there should be no "string representations" or paths to your items and blocks (tags are okay). and what you used is for translation and displaying on screen. now during registration, did you make a BlockItem instance for the purpose of creative tab? if you did, do stack.getItem().equals(staticBlockItemFromRegistration) frankly, i'm not sure what you need to do so if the above row didn't help, please paste problematic method.