One; Try and wash your hair every other day, washing it every day strips out your natural oils. To keep your hair looking fresh use dry shampoo or baby powder in between washes.
Three; When sleeping put your hair into a plait to stop your hair rubbing together and damaging when you are rolling around in your sleep!
Five; HAIR MASKS. I can not even stress to you how much I love hair masks. Oh My Days. They add so much shine and moisture to your hair which makes it so much healthier.
Last but not least get your hair trimmed regularly to get rid of any split ends that slow down the growth rate. Or what I also do is just seek out the unwanted split ends myself and trim them off with small bathroom scissors. Just make sure you trim the very ends and not a noticeable amount!