best shampoos that over dht resistant protection, and best conditioners?

[hairman4321]

I've just had a HT and have been told to use baby shampoo for the first 3 months.

After this, i'll want to start taking care of my hair with a good shampoo and conditioner.
Do you have any good brand recommendations for shampoo?

Re conditioner: Conditioner is something i've never really used before, and previously just managed the 'fine line' between hair being too dry and too oily by trying not to use too much shampoo or too often. Is this a good approach or is a conditioner best to use?