Using 2 Shampoos at a time / Your fav. Shampoo

i start with Head & shoulder, its healthy for the scalp, then rinse it off with warm water, use Biotera shampoo, it moisturizes/hydrates the hair, rinse hair again with warm water, now condition with biotera conditioner, leave it on for few minutes, then rinse rinse rinse with cold water…

Question: does this method of using 2 shampoos at a time could lead to any side effects?

whats your favorite shampoo?