Most of the digestion and absorption of the food takes place in the:

You must know that small intestine receives juices from liver, pancreas and walls of small intestine. Bile juice from liver emulsifies the fats and makes the medium alkaline. Pancreas and small intestine juices contain amylase, lipase and trypsin.
The function of these enzymes is:
Fats (Lipase / breakdown) → Fatty acid + glycerol
Carbohydrate (Amylase / breakdown) → glucose
Proteins (Trypsin / breakdown) → Amino acid