A topic I want to learn more on

If it’s possible, I am very curious, how is it that we know angels are good, and not bad. This question has been bugging me, same with another question which is. There are stories of many great things happening in the Bible, but I don’t think I can recall any being talked about and I haven’t seen any of these. But I want to know are angels really good? Is the archangels really good?