1. Triglycerides: These are the most common type of fat in our diet and in our bodies. They are composed of three fatty acids attached to a glycerol molecule. Triglycerides provide energy and help with the absorption of fat-soluble vitamins.

2. Phospholipids: These lipids have a similar structure to triglycerides, but with one fatty acid replaced by a phosphate group. This makes them both water-soluble and fat-soluble, allowing them to act as emulsifiers. Examples include lecithin, which is found in egg yolks and soybeans.

3. Sterols: These lipids have a complex ring structure. Cholesterol is a well-known example, and it's an important component of cell membranes. Plant sterols, like those found in nuts and seeds, can help lower cholesterol levels.

It's important to note that within each category, there are many different types of lipids, each with its own unique properties and effects on our health. For example, within triglycerides, we have saturated, monounsaturated, and polyunsaturated fats, each with different impacts on heart health.