Sleep on a satin pillowcase to prevent damage from tossing and turning.
If your hair is damaged, use a protein treatment at least once a week.
Switch to a boar bristle brush.
Switch from plastic combs to wooden or cellulose acetate. Plastic combs have molded seams on them that damage your hair cuticle.
Use distilled water as your final rinse. Tap water leaves mineral deposits on hair that can dull it and damage it.
If your hair is extremely dry, don't shampoo every day.
If you have fine, thin hair, stay away from any volumizing and thickening shampoos. They dry out your hair.
Stay away from hair accessories made with metal in them.
No one said having great looking and healthy hair at the same time would be easy. It takes some thought and experimentation. But since having great hair can make or break your look, it is always worth some extra effort.