If I had a nickel for every time this question has been asked, I'd be a rich man.
The colors of an aura don't mean anything. ”What?” Yes, that's correct – the colors themselves don't inherently mean anything. The only thing that they tell you is what kind of a personality the person has. Will I give a list of all the colors and all corresponding personalities? No. Why? Because this is a really good opportunity for you to practice what you've learned.
Learn what the colors mean like I did. Go around, and look at people's auras. Find a color you would like to know more about, identify who it belongs to, and watch them – learn from them. See how they act, their mannerisms – everything. I challenge you, not to look up a list of colors (especially since many of them are incorrect), but to make your own mental list of what colors define what personalities.
While the “base” color (red/orange/yellow/green/blue/purple) may lightly define their personality, it does little more. White doesn't mean, “That person's sick/dying,” and it also doesn't mean, “That person has good health and will live a long and helthy life.” What can tell you that, however, is the shade of their aura. What do I mean by “shade?” I mean how bright or dark it is. If it is a vivid color, then they are happy/healthy. If it is a darker or more dull/shallow color, then they are sad/sick. This is what to look for when seeing what kind of mood a person is in.