Pretty much anything that's not processed is a 'good carb': whole grains, like millet, quinoa, brown rice, wild rice, buckwheat, barley. All veggies and fruits are 'good carbs' as well, though some fruits, like bananas and watermelon, are higher glycemic, and some people may want to limit them.
By the way "wheat bread" is NOT a good carb. WHOLE wheat bread is. "Wheat bread" just means the flour comes from wheat, and it's a tricky way for manufacturers to trick the customer into thinking it's healthier than 'white flour', but unless it says "whoke," that's exactly what it is.
Bad carbs usually come in boxes or packages and are white.