Dota 2 NPC attachment points and Hitboxes - HELP!

so, the final things I need to add to my DotA 2 NPC before textures and animations are attachment points and hitboxes (<- this is the technical requirements to make an NPC in DotA 2). I haven’t a slight clue how to add either of these, what are they and how do I make them?? - PS the wiki doesn’t make any sense, that’s why I’m here.