One type of macro-nutrients is carbohydrates. They are an important source of energy. They can be either simple, like sugars, or complex, like starch and fiber. Read more about them here – https://medlineplus.gov/ency/article/002469.htm.
In the MyPlate eating plan, carbohydrates are often found in the Grains food group, as well as Fruit, Vegetables and even Protein (mainly in the form of fiber in legumes and nuts/seeds.
You can listen to a short podcast about carbs and calories here – https://www.npr.org/2018/12/12/676169439/the-truth-about-carbs-and-calories.
One way that we can improve our diets is by eating fewer added sugars. Too much sugar can have a negative effect on our health. Another thing you can do is switch from refined flours to whole grain – these types of grains have many benefits to your health.