How did angels get their halos? How did angels come to get halos? I don't think the Bible, Qu'ran, or Torah says anything about them. But now, when we say "angels," we think of winged humans with halos on top of them. So where did they come from?

I seem to recall it's actually related to visual iconography, not anything from a text. Divine beings were said to have a glow around them showing their divinity, and people drawing or painting had various ways to represent that. As painting styles changed, so did styles of the glow, eventually becoming first a disk behind the head and then the floating golden frisbee we currently see.