Nutrients are mainly absorbed in:
Small intestine
Large intestine
Liver
Stomach
Proteins, carbohydrates, fats and other nutritive substances like vitamins, and minerals are absorbed mostly in small intestine.
In the small intestine, secondary active transport of Na+ is important in bringing about absorption of glucose, some amino acids, and other substances such as bile acids.
Reference: GUYTON AND HALL TEXTBOOK OF MEDICAL PHYSIOLOGY, THIRTEENTH EDITION(INTERNATIONAL EDITION ) page no 464