1. Fats
Also known as lipids

2. Fats and oils are made up of triglycerides

3. Synthesis Saturated fatty acid Glycerol Unsaturated fatty acid
Fats with multiple double C=C bonds are called polyunsaturated fats

4. Triglyceride synthesis
Glycerol +
The synthesis of a triglyceride produces 3 water molecules

5. Shown step by step . . . . H2O monoglyceride OH O Fatty acid 1 HO O OH
ycero l OH O
Fatty acid 1 HO Gl
ycero l O OH
Fatty acid 1
Fatty acid 2 HO
H2O
diglyceride O O OH O OH Gl
ycero l
diglyceride HO
Fatty acid 3
H2O
triglyceride
This process is reversed in digestion with the help of bile & lipase

6. Triglycerides are held together by ESTER LINKAGES

7. Saturated and unsaturated fatty acids
If every carbon in the chain has all the hydrogen atoms it can bond to, then the fatty acid is said to be saturated. The middle fatty acid has two carbons that are one hydrogen short. That's because there's a double bond between those carbons. This fatty acid is said to be monounsaturated. The bottom fatty acid have two places where carbons don't have all the hydrogen atoms. This is polyunsaturated. The polyunsaturated fatty acids are said to be healthier.

8. Unsaturated fatty acids are bent
Extras
There are greater Van der Waals forces between straight chain fatty acids (and longer fatty acid chains) so they tend to be fats rather than oils.
You do not need to know the names of different fatty acids but you should be able to distinguish between saturated and unsaturated chains.
Unsaturated fatty acids are bent
Fats provide insulation, buoyancy and can be a source of water e.g. camels

9. Difficulty drawing triglycerides?
NB These do not show where the water molecules come from or the ester linkages

10. State three functions of lipids.
Lipids can be used for energy storage in the form of fat in humans and oil in plants.
Lipids can be used as heat insulation as fat under the skin reduces heat loss. 
Lipids allow buoyancy as they are less dense than water and so animals can float in water.