Hi,
It's good to use hair conditioner after each shampooing as it protects the cuticle of the hair shaft from damage done by dust/ pollution/ sunrays.
You can either apply aloe vera or few drops of cocconut oil after head wash (in wet hair) on the hair length or else other options are readymade herbal conditioners like Himalaya's, Patanjali's, VLCC's, Khadi's, Forest Essential's, etc.