Glucose is found in fruits and vegetables
Galactose is found in milk
Fructose is found in honey and some fruits and vegetables
Monoscharrides contain only one unit of carbohydrates, this includes Glucose, Fructose and Galactose which are found in different foods.
Disaccharides are more complex since they have two monosaccharides bonded together. The two most known disaccharides are sucrose, found in table sugar, and lactose ,found in the milk.
Polysaccharides are made up many monosaccharides and are often highly complex chains of long molecules. Two examples are starch found in plants and glycogen found in animals.