Wash hair sparingly and use a good-quality shampoo.
Washing hair too often can leave hair dried out, leached of its natural
oils, and may damage your hair. Aim to shampoo your hair at most every
other day or only twice a week.
Try shampoos that do not contain sulfates or parabens. Sulfates are the chemicals that make shampoos lather up.[1] Parabens are preservatives that cause irritation and eye problems after prolonged use[2]. Both of these chemicals aren't healthy for you or the environment so try to use shampoos with natural cleansers.
Choose a shampoo that suits your hair type. Don't just go for any old shampoo; go for the shampoo that works for your hair type. Typical types include (but are not limited to):
Curly or Afro-textured hair probably wants frizz-minimizing or softening shampoo that is creamy and has natural oils in it.
Straight or oily hair probably wants a gentle shampoo designed for daily washing.
Coloured or treated hair probably needs a shampoo that's fortified with extracts or amino acids, because treating your hair is essentially damaging it.