gato_borrachon

i know that, i need to use the bow but where can i get how is made that item? when im looking everywhere in the internet i dont find a tutorial for a beginner, i would like get a explain of what do everything that i write in the code, i only find code to copy-paste that have functions that refer to something like (World world, x, y, z,) i have no idea of what this mean, i know a bit of java but i never seen this before, refering especific to progaming in minecraft, the concepts that i know are that i need to make the weapon to reload, react to clicking to the left or right button of the mouse, spawn entities in the world (bullets), but i dont know where start coding all of this.

Is there a tutorial that teaches how to make fire weapons for 1.12.2? from making basic weapons like a pistol, shotgun or mp5 to make a rocket launcher or something like a napalm launcher and a flamethrower?