Know your hair type.
How would you describe your hair?
Is your hair fine?
Is your hair normal?
Is your hair dry and damaged?
Or is it color treated or permed?
Did you know that when you perm or color or use hot styling tools you are probably changing your hair type to some extent.
That's why it's important to get the right formula for your hair.

Yes i agrees with you megha, its very important to know your hair type before under going any treatment for them.

Its really important to know your hair type, as according to your hair you should get the relevant products, getting the wrong products will not help your hair and can make them worse.