Should I really use shampoo every night?

I don't know how much I should shampoo my hair, or condition it. I use both every night but my hair has become dry and gross and split ended and I hate it T_T please help.Should I really use shampoo every night?
Shampoo every other day or if you can every two/three days. Get a really good brand, like Panteen Pro-V moisture, shampoo and conditioner. Shampoo normally, then condition and leave in on for three or four minutes before you rinse it off. Brush your hair only when you have to (less brushing is better) and every week or so go through your hair looking for split ends and cut (just the split part) off with scissors.