The three types of lipids are: steroids, triglycerides and phospholipids. Each of these macromolecules is hydrophobic and therefore remains largely insoluble in water. Apart from that common factor, lipids are chemically diverse.
Steroids are all, by definition, built around a structure of four fused carbon rings. They are chemically unrelated to other lipids and are regarded as part of the lipid group due to their properties as a solute. Triglycerides are derived from a single molecule of glycerol that has fused with three molecules of various fatty acids. Phosphorolipids are closely related to triglycerides, though they tend to link up with two fatty acids rather than three. Phosphorolipids are also typically bonded with a highly polar molecule that can leave them hydrophobic at one end and hydrophilic at the other.