Carbs In Yogurt What Is The Difference Between Good Carbs And Bad Carbs?

What is the difference between good carbs and bad carbs? - carbs in yogurt

I eat very healthy, but I noticed something as simple as an apple can have a good amount of carbohydrates. What about yogurt and oatmeal? Necissarily carbohydrates are bad for you? Or just bread and starch to things that are bad? I'm confused!