There are two types of carbohydrates: simple and complex.  Simple carbs (think white flour and sugar) are also known as sugars.  They break down easily and tend to send blood sugar(glucose) levels soaring and out of control.  For the most part, you want to avoid simple carbs, with fruit as the exception.  Fruits are simple carbs, but they also contain fiber, which slows down their digestion, as well as give us vital nutrients and vitamins that we need.
Complex carbs are high in fiber and improve digestion.  They provide you with energy, keep you satisfied after meals and stabilize your blood sugar levels.  Vegetables, fruits and whole grains are all complex carbs.
Starchy complex carbs portion rules : you should eat 2 to 4 servings of complex carbs from whole grains or other starchy carb sources each day.
Examples of Starchy Complex Carbs from Whole Grains:

• Amaranth
• Brown rice
• Buckwheat
• Bulgur
• Cream of Wheat
• Millet
• Oatmeal
• Quinoa
• Wheat Germ
• Whole grain pasta

Starchy Carbs from Vegetable Sources: (you want to focus more here for weight loss!!)

• Bananas
• Carrots
• Chickpeas
• Beans (kidney, navy, pinto, soy)
• Sweet potatoes
• Potatoes
  
• Radishes
  
• Split peas
• Lentils
• Yams
  

There are many more, but these are a few of the most common!