Always be careful about the chemicals that you apply in your hair. Even some shampoos can be bad for your hair. For example, excessive use of sulfate detergents can cause your hair to become dry and weak from the root.
Never apply too much conditioner or never use a shampoo with sulfate. When your hair does not need moisture, it will not absorb excess moisture! So, always be very careful about the ingredients as well as the amount of the product you are applying in your hair.
Try different brands of shampoo and conditioner. Remember that expensive does not always mean better. The best ones are those which do not contain any inorganic chemical, alcohol, and artificial fragrance/color.