There shouldn't be any confusion. It's not very complicated. In most contexts, 'hang' is irregular: hang-hung-hung I hung out with my friends yesterday. I hung the picture on the wall. I hung out the washing to dry on the line. There is one - and only one - context in which the regular form, 'hanged', is used. We say 'hanged' when the verb 'hang' refers to the method of killing a person: Until the mid-20th century, convicted criminals were hanged. And that's it. That's all you need to know. Not so confusing, is it?