Shampoo, do you need it?!?

My hair is so dry and course

I never use shampoo I mean never I hate it

I never really thought it was important then someone told me it really is

& that is why my hair may be so dry.
I need advice!
Update: You dont get it! My hair is really ******* dry it's not greasy so thanks :]

I don't know what shampoo exactly does so yes, can it affect my hair being dry?
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