Did you ever go to school? In elementary school you should have seen something like this link. Let me introduce you to it because this is your friend when you are trying to figure out if something matches or not. Opposing colors ( those opposite of the color wheel) are dramatic and shouldn't be matched together, esp red and blue. Anything adjacent to it does however go together. Cold side vs Warm side and then you neutral colors. When you have a tertiary color wheel anything that is one color apart (every other color) is a great match for anything you do.