Be healthy for your hair.
When you become healthier, it follows that your hair would have improvements on its health as well. In other words, your hair would also grow faster than usual. Thus, it is best to follow healthy practices, if you want to grow your hair fast, as well as if you want it to look really beautiful.
Treat your hair well to make it grow faster.
If you want your hair to grow faster, you have to make sure that it is healthy as well. With that, you have to treat it well, so that it would become as healthy as possible. Treating it well means not using harmful products on it, and caring for it as much as you can each day.