Can someone explain to me the different json files? (InstantID_multi id, depth, ipadaptro, basic) etc

Hi, I am trying to understand what they do exalcty and how to use them?

Basic: You can use direclty ONE image with a face and you insert a prompt and model. OK
MultiID: I noticed there was 2 FACE images and a third image. I am still not sure what I should do or the best config, if I insert a face in the third image, (which is not croped), I obtain strange imamges where there are 2 or more bodies in a single image.. I suppose that image is for style or something? What if I insert 2 differnet faces? Tell me more about how best to use it.
Depth: only one image is face, the other can by anything. How best to use this?
Idaptor IP: Pretty understandable.

Summary: I dont undertand the nodes in MultiID, and I dont find a good use for depth, if you have any examples

cubiq / ComfyUI_InstantID