A shampoo is a cosmetic/medical product, specifically developed to clean the scalp, remove sebum and prevent the development of hair problems such as folliculitis and seborrhoeic dermatitis.
We need well-formulated shampoos to:
For best results, you need a shampoo that suits your hair type. The easiest way to find the right shampoo is to look for words on the label that describe your hair type, such as “dry,” “oily,” “frizzy” or “fine”.
Some common hair types are:
What should be the frequency of shampooing? 
Squeeze out a dime-sized amount into the centre of your hand and lather it up between your palms
Apply the shampoo, starting from the top of your head towards the back.
Gently distribute through the rest of your hair. (Massage – don’t rub – your scalp with your fingertips)