When you first start to exercise there can be many things that are confusing. Nutrition and fitness basics are some of the big ones. When people first get into fitness they are first faced with exercises, sets and reps, rest periods and then the mother load, Nutrition. .
Small frequent feedings of natural and unprocessed foods will beat any "special" fad diet for improving fitness and losing weight. Your body is made of what you eat so you must make sure that you are only putting quality foods into your body. A well balanced diet of nutritious carbohydrates, fats and proteins from natural sources will keep your body fueled with nutrients.
This leads us to the fundamental nutrition basic of how many calories do you need in a day ? That link there will lead you to a calculator that will tell you how many calories you should eat in a day. From there we need to know what the 3 pillars of nutrition are and what they do. The 3 basic macronutrients that make up a nutrition plan are Carbohydrates, fats and proteins.
Proper carbohydrate nutrition is important to fitness because carbohydrates create your energy that you work off while you exercise. Carbohydrates have gotten a bad rap lately and you can read about how this basic nutritional component should be included in your diet here at low carb stupidity .